first commit

2025-03-12 17:06:23 +01:00
commit 2241f7131f
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--- a/plugins/stPayNowPlugin/vendor/autoload.php
+++ b/plugins/stPayNowPlugin/vendor/autoload.php
@@ -0,0 +1,7 @@
+<?php
+
+// autoload.php @generated by Composer
+
+require_once __DIR__ . '/composer/autoload_real.php';
+
+return ComposerAutoloaderInitb1af4a2473faf4faf0fc0314fc29a6e4::getLoader();
--- a/plugins/stPayNowPlugin/vendor/clue/stream-filter/.github/FUNDING.yml
+++ b/plugins/stPayNowPlugin/vendor/clue/stream-filter/.github/FUNDING.yml
@@ -0,0 +1,2 @@
+github: clue
+custom: https://clue.engineering/support
--- a/plugins/stPayNowPlugin/vendor/clue/stream-filter/CHANGELOG.md
+++ b/plugins/stPayNowPlugin/vendor/clue/stream-filter/CHANGELOG.md
@@ -0,0 +1,75 @@
+# Changelog
+
+## 1.5.0 (2020-10-02)
+
+*   Feature: Improve performance by using global imports.
+    (#38 by @clue)
+
+*   Improve API documentation and add support / sponsorship info.
+    (#30 by @clue and #35 by @SimonFrings)
+
+*   Improve test suite and add `.gitattributes` to exclude dev files from exports.
+    Prepare PHP 8 support, update to PHPUnit 9 and simplify test matrix.
+    (#32 and #37 by @clue and #34 and #36 by @SimonFrings)
+
+## 1.4.1 (2019-04-09)
+
+*   Fix: Check if the function is declared before declaring it.
+    (#23 by @Niko9911)
+
+*   Improve test suite to also test against PHP 7.2 and
+    add test for base64 encoding and decoding filters.
+    (#22 by @arubacao and #25 by @Nyholm and @clue)
+
+## 1.4.0 (2017-08-18)
+
+*   Feature / Fix: The `fun()` function does not pass filter parameter `null`
+    to underlying `stream_filter_append()` by default
+    (#15 by @Nyholm)
+
+    Certain filters (such as `convert.quoted-printable-encode`) do not accept
+    a filter parameter at all. If no explicit filter parameter is given, we no
+    longer pass a default `null` value.
+
+    ```php
+    $encode = Filter\fun('convert.quoted-printable-encode');
+    assert('t=C3=A4st' === $encode('täst'));
+    ```
+
+*   Add examples and improve documentation
+    (#13 and #20 by @clue and #18 by @Nyholm)
+
+*   Improve test suite by adding PHPUnit to require-dev,
+    fix HHVM build for now again and ignore future HHVM build errors,
+    lock Travis distro so new future defaults will not break the build
+    and test on PHP 7.1
+    (#12, #14 and #19 by @clue and #16 by @Nyholm)
+
+## 1.3.0 (2015-11-08)
+
+*   Feature: Support accessing built-in filters as callbacks
+    (#5 by @clue)
+
+    ```php
+    $fun = Filter\fun('zlib.deflate');
+
+    $ret = $fun('hello') . $fun('world') . $fun();
+    assert('helloworld' === gzinflate($ret));
+    ```
+
+## 1.2.0 (2015-10-23)
+
+* Feature: Invoke close event when closing filter (flush buffer)
+  (#9 by @clue)
+
+## 1.1.0 (2015-10-22)
+
+* Feature: Abort filter operation when catching an Exception
+  (#10 by @clue)
+
+* Feature: Additional safeguards to prevent filter state corruption
+  (#7 by @clue)
+
+## 1.0.0 (2015-10-18)
+
+* First tagged release
--- a/plugins/stPayNowPlugin/vendor/clue/stream-filter/LICENSE
+++ b/plugins/stPayNowPlugin/vendor/clue/stream-filter/LICENSE
@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2015 Christian Lück
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is furnished
+to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
--- a/plugins/stPayNowPlugin/vendor/clue/stream-filter/README.md
+++ b/plugins/stPayNowPlugin/vendor/clue/stream-filter/README.md
@@ -0,0 +1,323 @@
+# clue/stream-filter [![Build Status](https://travis-ci.org/clue/php-stream-filter.svg?branch=master)](https://travis-ci.org/clue/php-stream-filter)
+
+A simple and modern approach to stream filtering in PHP
+
+**Table of contents**
+
+* [Why?](#why)
+* [Support us](#support-us)
+* [Usage](#usage)
+  * [append()](#append)
+  * [prepend()](#prepend)
+  * [fun()](#fun)
+  * [remove()](#remove)
+* [Install](#install)
+* [Tests](#tests)
+* [License](#license)
+
+## Why?
+
+PHP's stream filtering system is great!
+
+It offers very powerful stream filtering options and comes with a useful set of built-in filters.
+These filters can be used to easily and efficiently perform various transformations on-the-fly, such as:
+
+* read from a gzip'ed input file,
+* transcode from ISO-8859-1 (Latin1) to UTF-8,
+* write to a bzip output file
+* and much more.
+
+But let's face it:
+Its API is [*difficult to work with*](https://www.php.net/manual/en/php-user-filter.filter.php)
+and its documentation is [*subpar*](https://stackoverflow.com/questions/27103269/what-is-a-bucket-brigade).
+This combined means its powerful features are often neglected.
+
+This project aims to make these features more accessible to a broader audience.
+* **Lightweight, SOLID design** -
+  Provides a thin abstraction that is [*just good enough*](https://en.wikipedia.org/wiki/Principle_of_good_enough)
+  and does not get in your way.
+  Custom filters require trivial effort.
+* **Good test coverage** -
+  Comes with an automated tests suite and is regularly tested in the *real world*
+
+## Support us
+
+We invest a lot of time developing, maintaining and updating our awesome
+open-source projects. You can help us sustain this high-quality of our work by
+[becoming a sponsor on GitHub](https://github.com/sponsors/clue). Sponsors get
+numerous benefits in return, see our [sponsoring page](https://github.com/sponsors/clue)
+for details.
+
+Let's take these projects to the next level together! 🚀
+
+## Usage
+
+This lightweight library consists only of a few simple functions.
+All functions reside under the `Clue\StreamFilter` namespace.
+
+The below examples assume you use an import statement similar to this:
+
+```php
+use Clue\StreamFilter as Filter;
+
+Filter\append(…);
+```
+
+Alternatively, you can also refer to them with their fully-qualified name:
+
+```php
+\Clue\StreamFilter\append(…);
+```
+
+As of PHP 5.6+ you can also import each required function into your code like this:
+
+```php
+use function Clue\StreamFilter\append;
+
+append(…);
+```
+
+### append()
+
+The `append(resource<stream> $stream, callable $callback, int $read_write = STREAM_FILTER_ALL): resource<stream filter>` function can be used to
+append a filter callback to the given stream.
+
+Each stream can have a list of filters attached.
+This function appends a filter to the end of this list.
+
+If the given filter can not be added, it throws an `Exception`.
+
+The `$stream` can be any valid stream resource, such as:
+
+```php
+$stream = fopen('demo.txt', 'w+');
+```
+
+The `$callback` should be a valid callable function which accepts 
+an individual chunk of data and should return the updated chunk:
+
+```php
+$filter = Filter\append($stream, function ($chunk) {
+    // will be called each time you read or write a $chunk to/from the stream
+    return $chunk;
+});
+```
+
+As such, you can also use native PHP functions or any other `callable`:
+
+```php
+Filter\append($stream, 'strtoupper');
+
+// will write "HELLO" to the underlying stream
+fwrite($stream, 'hello');
+```
+
+If the `$callback` accepts invocation without parameters,
+then this signature will be invoked once ending (flushing) the filter:
+
+```php
+Filter\append($stream, function ($chunk = null) {
+    if ($chunk === null) {
+        // will be called once ending the filter
+        return 'end';
+    }
+    // will be called each time you read or write a $chunk to/from the stream
+    return $chunk;
+});
+
+fclose($stream);
+```
+
+> Note: Legacy PHP versions (PHP < 5.4) do not support passing additional data
+from the end signal handler if the stream is being closed.
+
+If your callback throws an `Exception`, then the filter process will be aborted.
+In order to play nice with PHP's stream handling,
+the `Exception` will be transformed to a PHP warning instead:
+
+```php
+Filter\append($stream, function ($chunk) {
+    throw new \RuntimeException('Unexpected chunk');
+});
+
+// raises an E_USER_WARNING with "Error invoking filter: Unexpected chunk"
+fwrite($stream, 'hello');
+```
+
+The optional `$read_write` parameter can be used to only invoke the `$callback`
+when either writing to the stream or only when reading from the stream:
+
+```php
+Filter\append($stream, function ($chunk) {
+    // will be called each time you write to the stream
+    return $chunk;
+}, STREAM_FILTER_WRITE);
+
+Filter\append($stream, function ($chunk) {
+    // will be called each time you read from the stream
+    return $chunk;
+}, STREAM_FILTER_READ);
+```
+
+This function returns a filter resource which can be passed to [`remove()`](#remove).
+
+> Note that once a filter has been added to stream, the stream can no longer be passed to
+> [`stream_select()`](https://www.php.net/manual/en/function.stream-select.php)
+> (and family).
+>
+> > Warning: stream_select(): cannot cast a filtered stream on this system in {file} on line {line}
+>
+> This is due to limitations of PHP's stream filter support, as it can no longer reliably
+> tell when the underlying stream resource is actually ready.
+> As an alternative, consider calling `stream_select()` on the unfiltered stream and
+> then pass the unfiltered data through the [`fun()`](#fun) function.
+
+### prepend()
+
+The `prepend(resource<stream> $stream, callable $callback, int $read_write = STREAM_FILTER_ALL): resource<stream filter>` function can be used to
+prepend a filter callback to the given stream.
+
+Each stream can have a list of filters attached.
+This function prepends a filter to the start of this list.
+
+If the given filter can not be added, it throws an `Exception`.
+
+```php
+$filter = Filter\prepend($stream, function ($chunk) {
+    // will be called each time you read or write a $chunk to/from the stream
+    return $chunk;
+});
+```
+
+This function returns a filter resource which can be passed to [`remove()`](#remove).
+
+Except for the position in the list of filters, this function behaves exactly
+like the [`append()`](#append) function.
+For more details about its behavior, see also the [`append()`](#append) function.
+
+### fun()
+
+The `fun(string $filter, mixed $parameters = null): callable` function can be used to
+create a filter function which uses the given built-in `$filter`.
+
+PHP comes with a useful set of [built-in filters](https://www.php.net/manual/en/filters.php).
+Using `fun()` makes accessing these as easy as passing an input string to filter
+and getting the filtered output string.
+
+```php
+$fun = Filter\fun('string.rot13');
+
+assert('grfg' === $fun('test'));
+assert('test' === $fun($fun('test'));
+```
+
+Please note that not all filter functions may be available depending 
+on installed PHP extensions and the PHP version in use.
+In particular, [HHVM](https://hhvm.com/) may not offer the same filter functions
+or parameters as Zend PHP.
+Accessing an unknown filter function will result in a `RuntimeException`:
+
+```php
+Filter\fun('unknown'); // throws RuntimeException
+```
+
+Some filters may accept or require additional filter parameters – most
+filters do not require filter parameters.
+If given, the optional `$parameters` argument will be passed to the
+underlying filter handler as-is.
+In particular, note how *not passing* this parameter at all differs from
+explicitly passing a `null` value (which many filters do not accept).
+Please refer to the individual filter definition for more details.
+For example, the `string.strip_tags` filter can be invoked like this:
+
+```php
+$fun = Filter\fun('string.strip_tags', '<a><b>');
+
+$ret = $fun('<b>h<br>i</b>');
+assert('<b>hi</b>' === $ret);
+```
+
+Under the hood, this function allocates a temporary memory stream, so it's
+recommended to clean up the filter function after use.
+Also, some filter functions (in particular the
+[zlib compression filters](https://www.php.net/manual/en/filters.compression.php))
+may use internal buffers and may emit a final data chunk on close.
+The filter function can be closed by invoking without any arguments:
+
+```php
+$fun = Filter\fun('zlib.deflate');
+
+$ret = $fun('hello') . $fun('world') . $fun();
+assert('helloworld' === gzinflate($ret));
+```
+
+The filter function must not be used anymore after it has been closed.
+Doing so will result in a `RuntimeException`:
+
+```php
+$fun = Filter\fun('string.rot13');
+$fun();
+
+$fun('test'); // throws RuntimeException
+```
+
+> Note: If you're using the zlib compression filters, then you should be wary
+about engine inconsistencies between different PHP versions and HHVM.
+These inconsistencies exist in the underlying PHP engines and there's little we
+can do about this in this library.
+[Our test suite](tests/) contains several test cases that exhibit these issues.
+If you feel some test case is missing or outdated, we're happy to accept PRs! :)
+
+### remove()
+
+The `remove(resource<stream filter> $filter): bool` function can be used to
+remove a filter previously added via [`append()`](#append) or [`prepend()`](#prepend).
+
+```php
+$filter = Filter\append($stream, function () {
+    // …
+});
+Filter\remove($filter);
+```
+
+## Install
+
+The recommended way to install this library is [through Composer](https://getcomposer.org).
+[New to Composer?](https://getcomposer.org/doc/00-intro.md)
+
+This project follows [SemVer](https://semver.org/).
+This will install the latest supported version:
+
+```bash
+$ composer require clue/stream-filter:^1.5
+```
+
+See also the [CHANGELOG](CHANGELOG.md) for details about version upgrades.
+
+This project aims to run on any platform and thus does not require any PHP
+extensions and supports running on legacy PHP 5.3 through current PHP 7+ and
+HHVM.
+It's *highly recommended to use PHP 7+* for this project.
+Older PHP versions may suffer from a number of inconsistencies documented above.
+
+## Tests
+
+To run the test suite, you first need to clone this repo and then install all
+dependencies [through Composer](https://getcomposer.org):
+
+```bash
+$ composer install
+```
+
+To run the test suite, go to the project root and run:
+
+```bash
+$ php vendor/bin/phpunit
+```
+
+## License
+
+This project is released under the permissive [MIT license](LICENSE).
+
+> Did you know that I offer custom development services and issuing invoices for
+  sponsorships of releases and for contributions? Contact me (@clue) for details.
--- a/plugins/stPayNowPlugin/vendor/clue/stream-filter/composer.json
+++ b/plugins/stPayNowPlugin/vendor/clue/stream-filter/composer.json
@@ -0,0 +1,26 @@
+{
+    "name": "clue/stream-filter",
+    "description": "A simple and modern approach to stream filtering in PHP",
+    "keywords": ["stream", "callback", "filter", "php_user_filter", "stream_filter_append", "stream_filter_register", "bucket brigade"],
+    "homepage": "https://github.com/clue/php-stream-filter",
+    "license": "MIT",
+    "authors": [
+        {
+            "name": "Christian Lück",
+            "email": "christian@clue.engineering"
+        }
+    ],
+    "require": {
+        "php": ">=5.3"
+    },
+    "require-dev": {
+        "phpunit/phpunit": "^9.3 || ^5.7 || ^4.8.36"
+    },
+    "autoload": {
+        "psr-4": { "Clue\\StreamFilter\\": "src/" },
+        "files": [ "src/functions_include.php" ]
+    },
+    "autoload-dev": {
+        "psr-4": { "Clue\\Tests\\StreamFilter\\": "tests/" }
+    }
+}
--- a/plugins/stPayNowPlugin/vendor/clue/stream-filter/examples/base64_decode.php
+++ b/plugins/stPayNowPlugin/vendor/clue/stream-filter/examples/base64_decode.php
@@ -0,0 +1,29 @@
+<?php
+
+// $ echo test | php examples/base64_encode.php | php examples/base64_decode.php
+
+require __DIR__ . '/../vendor/autoload.php';
+
+// decoding requires buffering in chunks of 4 bytes each
+$buffer = '';
+Clue\StreamFilter\append(STDIN, function ($chunk = null) use (&$buffer) {
+    if ($chunk === null) {
+        if (strlen($buffer) % 4 !== 0) {
+            throw new \UnexpectedValueException('Invalid length');
+        }
+        $chunk = $buffer;
+    } else {
+        $buffer .= $chunk;
+        $len = strlen($buffer) - (strlen($buffer) % 4);
+        $chunk = (string)substr($buffer, 0, $len);
+        $buffer = (string)substr($buffer, $len);
+    }
+
+    $ret = base64_decode($chunk, true);
+    if ($ret === false) {
+        throw new \UnexpectedValueException('Not a valid base64 encoded chunk');
+    }
+    return $ret;
+}, STREAM_FILTER_READ);
+
+fpassthru(STDIN);
--- a/plugins/stPayNowPlugin/vendor/clue/stream-filter/examples/base64_encode.php
+++ b/plugins/stPayNowPlugin/vendor/clue/stream-filter/examples/base64_encode.php
@@ -0,0 +1,21 @@
+<?php
+
+// $ echo test | php examples/base64_encode.php | base64 --decode
+
+require __DIR__ . '/../vendor/autoload.php';
+
+// encoding requires buffering in chunks of 3 bytes each
+$buffer = '';
+Clue\StreamFilter\append(STDIN, function ($chunk = null) use (&$buffer) {
+    if ($chunk === null) {
+        return base64_encode($buffer);
+    }
+    $buffer .= $chunk;
+    $len = strlen($buffer) - (strlen($buffer) % 3);
+    $chunk = substr($buffer, 0, $len);
+    $buffer = substr($buffer, $len);
+
+    return base64_encode($chunk);
+}, STREAM_FILTER_READ);
+
+fpassthru(STDIN);
--- a/plugins/stPayNowPlugin/vendor/clue/stream-filter/examples/uppercase.php
+++ b/plugins/stPayNowPlugin/vendor/clue/stream-filter/examples/uppercase.php
@@ -0,0 +1,9 @@
+<?php
+
+// $ echo test | php examples/uppercase.php
+
+require __DIR__ . '/../vendor/autoload.php';
+
+Clue\StreamFilter\append(STDIN, 'strtoupper');
+
+fpassthru(STDIN);
--- a/plugins/stPayNowPlugin/vendor/clue/stream-filter/phpunit.xml.dist
+++ b/plugins/stPayNowPlugin/vendor/clue/stream-filter/phpunit.xml.dist
@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<phpunit bootstrap="vendor/autoload.php"
+         colors="true"
+         convertErrorsToExceptions="true"
+         convertNoticesToExceptions="true"
+         convertWarningsToExceptions="true"
+>
+    <testsuites>
+        <testsuite>
+            <directory>./tests/</directory>
+        </testsuite>
+    </testsuites>
+    <filter>
+        <whitelist>
+            <directory>./src/</directory>
+        </whitelist>
+    </filter>
+</phpunit>
--- a/plugins/stPayNowPlugin/vendor/clue/stream-filter/src/CallbackFilter.php
+++ b/plugins/stPayNowPlugin/vendor/clue/stream-filter/src/CallbackFilter.php
@@ -0,0 +1,114 @@
+<?php
+
+namespace Clue\StreamFilter;
+
+/**
+ * @internal
+ * @see append()
+ * @see prepend()
+ */
+class CallbackFilter extends \php_user_filter
+{
+    private $callback;
+    private $closed = true;
+    private $supportsClose = false;
+
+    public function onCreate()
+    {
+        $this->closed = false;
+
+        if (!\is_callable($this->params)) {
+            throw new \InvalidArgumentException('No valid callback parameter given to stream_filter_(append|prepend)');
+        }
+        $this->callback = $this->params;
+
+        // callback supports end event if it accepts invocation without arguments
+        $ref = new \ReflectionFunction($this->callback);
+        $this->supportsClose = ($ref->getNumberOfRequiredParameters() === 0);
+
+        return true;
+    }
+
+    public function onClose()
+    {
+        $this->closed = true;
+
+        // callback supports closing and is not already closed
+        if ($this->supportsClose) {
+            $this->supportsClose = false;
+            // invoke without argument to signal end and discard resulting buffer
+            try {
+                \call_user_func($this->callback);
+            } catch (\Exception $ignored) {
+                // this might be called during engine shutdown, so it's not safe
+                // to raise any errors or exceptions here
+                // trigger_error('Error closing filter: ' . $ignored->getMessage(), E_USER_WARNING);
+            }
+        }
+
+        $this->callback = null;
+    }
+
+    public function filter($in, $out, &$consumed, $closing)
+    {
+        // concatenate whole buffer from input brigade
+        $data = '';
+        while ($bucket = \stream_bucket_make_writeable($in)) {
+            $consumed += $bucket->datalen;
+            $data .= $bucket->data;
+        }
+
+        // skip processing callback that already ended
+        if ($this->closed) {
+            return \PSFS_FEED_ME;
+        }
+
+        // only invoke filter function if buffer is not empty
+        // this may skip flushing a closing filter
+        if ($data !== '') {
+            try {
+                $data = \call_user_func($this->callback, $data);
+            } catch (\Exception $e) {
+                // exception should mark filter as closed
+                $this->onClose();
+                \trigger_error('Error invoking filter: ' . $e->getMessage(), \E_USER_WARNING);
+
+                return \PSFS_ERR_FATAL;
+            }
+        }
+
+        // mark filter as closed after processing closing chunk
+        if ($closing) {
+            $this->closed = true;
+
+            // callback supports closing and is not already closed
+            if ($this->supportsClose) {
+                $this->supportsClose = false;
+
+                // invoke without argument to signal end and append resulting buffer
+                try {
+                    $data .= \call_user_func($this->callback);
+                } catch (\Exception $e) {
+                    \trigger_error('Error ending filter: ' . $e->getMessage(), \E_USER_WARNING);
+
+                    return \PSFS_ERR_FATAL;
+                }
+            }
+        }
+
+        if ($data !== '') {
+            // create a new bucket for writing the resulting buffer to the output brigade
+            // reusing an existing bucket turned out to be bugged in some environments (ancient PHP versions and HHVM)
+            $bucket = @\stream_bucket_new($this->stream, $data);
+
+            // legacy PHP versions (PHP < 5.4) do not support passing data from the event signal handler
+            // because closing the stream invalidates the stream and its stream bucket brigade before
+            // invoking the filter close handler.
+            if ($bucket !== false) {
+                \stream_bucket_append($out, $bucket);
+            }
+        }
+
+        return \PSFS_PASS_ON;
+    }
+}
--- a/plugins/stPayNowPlugin/vendor/clue/stream-filter/src/functions.php
+++ b/plugins/stPayNowPlugin/vendor/clue/stream-filter/src/functions.php
@@ -0,0 +1,327 @@
+<?php
+
+namespace Clue\StreamFilter;
+
+/**
+ * Append a filter callback to the given stream.
+ *
+ * Each stream can have a list of filters attached.
+ * This function appends a filter to the end of this list.
+ *
+ * If the given filter can not be added, it throws an `Exception`.
+ *
+ * The `$stream` can be any valid stream resource, such as:
+ *
+ * ```php
+ * $stream = fopen('demo.txt', 'w+');
+ * ```
+ *
+ * The `$callback` should be a valid callable function which accepts
+ * an individual chunk of data and should return the updated chunk:
+ *
+ * ```php
+ * $filter = Filter\append($stream, function ($chunk) {
+ *     // will be called each time you read or write a $chunk to/from the stream
+ *     return $chunk;
+ * });
+ * ```
+ *
+ * As such, you can also use native PHP functions or any other `callable`:
+ *
+ * ```php
+ * Filter\append($stream, 'strtoupper');
+ *
+ * // will write "HELLO" to the underlying stream
+ * fwrite($stream, 'hello');
+ * ```
+ *
+ * If the `$callback` accepts invocation without parameters,
+ * then this signature will be invoked once ending (flushing) the filter:
+ *
+ * ```php
+ * Filter\append($stream, function ($chunk = null) {
+ *     if ($chunk === null) {
+ *         // will be called once ending the filter
+ *         return 'end';
+ *     }
+ *     // will be called each time you read or write a $chunk to/from the stream
+ *     return $chunk;
+ * });
+ *
+ * fclose($stream);
+ * ```
+ *
+ * > Note: Legacy PHP versions (PHP < 5.4) do not support passing additional data
+ * from the end signal handler if the stream is being closed.
+ *
+ * If your callback throws an `Exception`, then the filter process will be aborted.
+ * In order to play nice with PHP's stream handling,
+ * the `Exception` will be transformed to a PHP warning instead:
+ *
+ * ```php
+ * Filter\append($stream, function ($chunk) {
+ *     throw new \RuntimeException('Unexpected chunk');
+ * });
+ *
+ * // raises an E_USER_WARNING with "Error invoking filter: Unexpected chunk"
+ * fwrite($stream, 'hello');
+ * ```
+ *
+ * The optional `$read_write` parameter can be used to only invoke the `$callback`
+ * when either writing to the stream or only when reading from the stream:
+ *
+ * ```php
+ * Filter\append($stream, function ($chunk) {
+ *     // will be called each time you write to the stream
+ *     return $chunk;
+ * }, STREAM_FILTER_WRITE);
+ *
+ * Filter\append($stream, function ($chunk) {
+ *     // will be called each time you read from the stream
+ *     return $chunk;
+ * }, STREAM_FILTER_READ);
+ * ```
+ *
+ * This function returns a filter resource which can be passed to [`remove()`](#remove).
+ *
+ * > Note that once a filter has been added to stream, the stream can no longer be passed to
+ * > [`stream_select()`](https://www.php.net/manual/en/function.stream-select.php)
+ * > (and family).
+ * >
+ * > > Warning: stream_select(): cannot cast a filtered stream on this system in {file} on line {line}
+ * >
+ * > This is due to limitations of PHP's stream filter support, as it can no longer reliably
+ * > tell when the underlying stream resource is actually ready.
+ * > As an alternative, consider calling `stream_select()` on the unfiltered stream and
+ * > then pass the unfiltered data through the [`fun()`](#fun) function.
+ *
+ * @param resource $stream
+ * @param callable $callback
+ * @param int $read_write
+ * @return resource filter resource which can be used for `remove()`
+ * @throws \Exception on error
+ * @uses stream_filter_append()
+ */
+function append($stream, $callback, $read_write = STREAM_FILTER_ALL)
+{
+    $ret = @\stream_filter_append($stream, register(), $read_write, $callback);
+
+    // PHP 8 throws above on type errors, older PHP and memory issues can throw here
+    // @codeCoverageIgnoreStart
+    if ($ret === false) {
+        $error = \error_get_last() + array('message' => '');
+        throw new \RuntimeException('Unable to append filter: ' . $error['message']);
+    }
+    // @codeCoverageIgnoreEnd
+
+    return $ret;
+}
+
+/**
+ * Prepend a filter callback to the given stream.
+ *
+ * Each stream can have a list of filters attached.
+ * This function prepends a filter to the start of this list.
+ *
+ * If the given filter can not be added, it throws an `Exception`.
+ *
+ * ```php
+ * $filter = Filter\prepend($stream, function ($chunk) {
+ *     // will be called each time you read or write a $chunk to/from the stream
+ *     return $chunk;
+ * });
+ * ```
+ *
+ * This function returns a filter resource which can be passed to [`remove()`](#remove).
+ *
+ * Except for the position in the list of filters, this function behaves exactly
+ * like the [`append()`](#append) function.
+ * For more details about its behavior, see also the [`append()`](#append) function.
+ *
+ * @param resource $stream
+ * @param callable $callback
+ * @param int $read_write
+ * @return resource filter resource which can be used for `remove()`
+ * @throws \Exception on error
+ * @uses stream_filter_prepend()
+ */
+function prepend($stream, $callback, $read_write = STREAM_FILTER_ALL)
+{
+    $ret = @\stream_filter_prepend($stream, register(), $read_write, $callback);
+
+    // PHP 8 throws above on type errors, older PHP and memory issues can throw here
+    // @codeCoverageIgnoreStart
+    if ($ret === false) {
+        $error = \error_get_last() + array('message' => '');
+        throw new \RuntimeException('Unable to prepend filter: ' . $error['message']);
+    }
+    // @codeCoverageIgnoreEnd
+
+    return $ret;
+}
+
+/**
+ * Create a filter function which uses the given built-in `$filter`.
+ *
+ * PHP comes with a useful set of [built-in filters](https://www.php.net/manual/en/filters.php).
+ * Using `fun()` makes accessing these as easy as passing an input string to filter
+ * and getting the filtered output string.
+ *
+ * ```php
+ * $fun = Filter\fun('string.rot13');
+ *
+ * assert('grfg' === $fun('test'));
+ * assert('test' === $fun($fun('test'));
+ * ```
+ *
+ * Please note that not all filter functions may be available depending
+ * on installed PHP extensions and the PHP version in use.
+ * In particular, [HHVM](https://hhvm.com/) may not offer the same filter functions
+ * or parameters as Zend PHP.
+ * Accessing an unknown filter function will result in a `RuntimeException`:
+ *
+ * ```php
+ * Filter\fun('unknown'); // throws RuntimeException
+ * ```
+ *
+ * Some filters may accept or require additional filter parameters – most
+ * filters do not require filter parameters.
+ * If given, the optional `$parameters` argument will be passed to the
+ * underlying filter handler as-is.
+ * In particular, note how *not passing* this parameter at all differs from
+ * explicitly passing a `null` value (which many filters do not accept).
+ * Please refer to the individual filter definition for more details.
+ * For example, the `string.strip_tags` filter can be invoked like this:
+ *
+ * ```php
+ * $fun = Filter\fun('string.strip_tags', '<a><b>');
+ *
+ * $ret = $fun('<b>h<br>i</b>');
+ * assert('<b>hi</b>' === $ret);
+ * ```
+ *
+ * Under the hood, this function allocates a temporary memory stream, so it's
+ * recommended to clean up the filter function after use.
+ * Also, some filter functions (in particular the
+ * [zlib compression filters](https://www.php.net/manual/en/filters.compression.php))
+ * may use internal buffers and may emit a final data chunk on close.
+ * The filter function can be closed by invoking without any arguments:
+ *
+ * ```php
+ * $fun = Filter\fun('zlib.deflate');
+ *
+ * $ret = $fun('hello') . $fun('world') . $fun();
+ * assert('helloworld' === gzinflate($ret));
+ * ```
+ *
+ * The filter function must not be used anymore after it has been closed.
+ * Doing so will result in a `RuntimeException`:
+ *
+ * ```php
+ * $fun = Filter\fun('string.rot13');
+ * $fun();
+ *
+ * $fun('test'); // throws RuntimeException
+ * ```
+ *
+ * > Note: If you're using the zlib compression filters, then you should be wary
+ * about engine inconsistencies between different PHP versions and HHVM.
+ * These inconsistencies exist in the underlying PHP engines and there's little we
+ * can do about this in this library.
+ * [Our test suite](tests/) contains several test cases that exhibit these issues.
+ * If you feel some test case is missing or outdated, we're happy to accept PRs! :)
+ *
+ * @param string $filter     built-in filter name. See stream_get_filters() or http://php.net/manual/en/filters.php
+ * @param mixed  $parameters (optional) parameters to pass to the built-in filter as-is
+ * @return callable a filter callback which can be append()'ed or prepend()'ed
+ * @throws \RuntimeException on error
+ * @link http://php.net/manual/en/filters.php
+ * @see stream_get_filters()
+ * @see append()
+ */
+function fun($filter, $parameters = null)
+{
+    $fp = \fopen('php://memory', 'w');
+    if (\func_num_args() === 1) {
+        $filter = @\stream_filter_append($fp, $filter, \STREAM_FILTER_WRITE);
+    } else {
+        $filter = @\stream_filter_append($fp, $filter, \STREAM_FILTER_WRITE, $parameters);
+    }
+
+    if ($filter === false) {
+        \fclose($fp);
+        $error = \error_get_last() + array('message' => '');
+        throw new \RuntimeException('Unable to access built-in filter: ' . $error['message']);
+    }
+
+    // append filter function which buffers internally
+    $buffer = '';
+    append($fp, function ($chunk) use (&$buffer) {
+        $buffer .= $chunk;
+
+        // always return empty string in order to skip actually writing to stream resource
+        return '';
+    }, \STREAM_FILTER_WRITE);
+
+    $closed = false;
+
+    return function ($chunk = null) use ($fp, $filter, &$buffer, &$closed) {
+        if ($closed) {
+            throw new \RuntimeException('Unable to perform operation on closed stream');
+        }
+        if ($chunk === null) {
+            $closed = true;
+            $buffer = '';
+            \fclose($fp);
+            return $buffer;
+        }
+        // initialize buffer and invoke filters by attempting to write to stream
+        $buffer = '';
+        \fwrite($fp, $chunk);
+
+        // buffer now contains everything the filter function returned
+        return $buffer;
+    };
+}
+
+/**
+ * Remove a filter previously added via `append()` or `prepend()`.
+ *
+ * ```php
+ * $filter = Filter\append($stream, function () {
+ *     // …
+ * });
+ * Filter\remove($filter);
+ * ```
+ *
+ * @param resource $filter
+ * @return bool true on success or false on error
+ * @throws \RuntimeException on error
+ * @uses stream_filter_remove()
+ */
+function remove($filter)
+{
+    if (@\stream_filter_remove($filter) === false) {
+        // PHP 8 throws above on type errors, older PHP and memory issues can throw here
+        $error = \error_get_last();
+        throw new \RuntimeException('Unable to remove filter: ' . $error['message']);
+    }
+}
+
+/**
+ * Registers the callback filter and returns the resulting filter name
+ *
+ * There should be little reason to call this function manually.
+ *
+ * @return string filter name
+ * @uses CallbackFilter
+ */
+function register()
+{
+    static $registered = null;
+    if ($registered === null) {
+        $registered = 'stream-callback';
+        \stream_filter_register($registered, __NAMESPACE__ . '\CallbackFilter');
+    }
+    return $registered;
+}
--- a/plugins/stPayNowPlugin/vendor/clue/stream-filter/src/functions_include.php
+++ b/plugins/stPayNowPlugin/vendor/clue/stream-filter/src/functions_include.php
@@ -0,0 +1,6 @@
+<?php
+
+// @codeCoverageIgnoreStart
+if (!\function_exists('Clue\\StreamFilter\\append')) {
+    require __DIR__ . '/functions.php';
+}
--- a/plugins/stPayNowPlugin/vendor/clue/stream-filter/tests/FilterTest.php
+++ b/plugins/stPayNowPlugin/vendor/clue/stream-filter/tests/FilterTest.php
@@ -0,0 +1,386 @@
+<?php
+
+use Clue\StreamFilter;
+
+class FilterTest extends PHPUnit_Framework_TestCase
+{
+    public function testAppendSimpleCallback()
+    {
+        $stream = $this->createStream();
+
+        StreamFilter\append($stream, function ($chunk) {
+            return strtoupper($chunk);
+        });
+
+        fwrite($stream, 'hello');
+        fwrite($stream, 'world');
+        rewind($stream);
+
+        $this->assertEquals('HELLOWORLD', stream_get_contents($stream));
+
+        fclose($stream);
+    }
+
+    public function testAppendNativePhpFunction()
+    {
+        $stream = $this->createStream();
+
+        StreamFilter\append($stream, 'strtoupper');
+
+        fwrite($stream, 'hello');
+        fwrite($stream, 'world');
+        rewind($stream);
+
+        $this->assertEquals('HELLOWORLD', stream_get_contents($stream));
+
+        fclose($stream);
+    }
+
+    public function testAppendChangingChunkSize()
+    {
+        $stream = $this->createStream();
+
+        StreamFilter\append($stream, function ($chunk) {
+            return str_replace(array('a','e','i','o','u'), '', $chunk);
+        });
+
+        fwrite($stream, 'hello');
+        fwrite($stream, 'world');
+        rewind($stream);
+
+        $this->assertEquals('hllwrld', stream_get_contents($stream));
+
+        fclose($stream);
+    }
+
+    public function testAppendReturningEmptyStringWillNotPassThrough()
+    {
+        $stream = $this->createStream();
+
+        StreamFilter\append($stream, function ($chunk) {
+            return '';
+        });
+
+        fwrite($stream, 'hello');
+        fwrite($stream, 'world');
+        rewind($stream);
+
+        $this->assertEquals('', stream_get_contents($stream));
+
+        fclose($stream);
+    }
+
+    public function testAppendEndEventCanBeBufferedOnClose()
+    {
+        if (PHP_VERSION < 5.4) $this->markTestSkipped('Not supported on legacy PHP');
+
+        $stream = $this->createStream();
+
+        StreamFilter\append($stream, function ($chunk = null) {
+            if ($chunk === null) {
+                // this signals the end event
+                return '!';
+            }
+            return $chunk . ' ';
+        }, STREAM_FILTER_WRITE);
+
+        $buffered = '';
+        StreamFilter\append($stream, function ($chunk) use (&$buffered) {
+            $buffered .= $chunk;
+            return '';
+        });
+
+        fwrite($stream, 'hello');
+        fwrite($stream, 'world');
+
+        fclose($stream);
+
+        $this->assertEquals('hello world !', $buffered);
+    }
+
+    public function testAppendEndEventWillBeCalledOnRemove()
+    {
+        $stream = $this->createStream();
+
+        $ended = false;
+        $filter = StreamFilter\append($stream, function ($chunk = null) use (&$ended) {
+            if ($chunk === null) {
+                $ended = true;
+            }
+            return $chunk;
+        }, STREAM_FILTER_WRITE);
+
+        $this->assertEquals(0, $ended);
+        StreamFilter\remove($filter);
+        $this->assertEquals(1, $ended);
+    }
+
+    public function testAppendEndEventWillBeCalledOnClose()
+    {
+        $stream = $this->createStream();
+
+        $ended = false;
+        StreamFilter\append($stream, function ($chunk = null) use (&$ended) {
+            if ($chunk === null) {
+                $ended = true;
+            }
+            return $chunk;
+        }, STREAM_FILTER_WRITE);
+
+        $this->assertEquals(0, $ended);
+        fclose($stream);
+        $this->assertEquals(1, $ended);
+    }
+
+    public function testAppendWriteOnly()
+    {
+        $stream = $this->createStream();
+
+        $invoked = 0;
+
+        StreamFilter\append($stream, function ($chunk) use (&$invoked) {
+            ++$invoked;
+
+            return $chunk;
+        }, STREAM_FILTER_WRITE);
+
+        fwrite($stream, 'a');
+        fwrite($stream, 'b');
+        fwrite($stream, 'c');
+        rewind($stream);
+
+        $this->assertEquals(3, $invoked);
+        $this->assertEquals('abc', stream_get_contents($stream));
+
+        fclose($stream);
+    }
+
+    public function testAppendReadOnly()
+    {
+        $stream = $this->createStream();
+
+        $invoked = 0;
+
+        StreamFilter\append($stream, function ($chunk) use (&$invoked) {
+            ++$invoked;
+
+            return $chunk;
+        }, STREAM_FILTER_READ);
+
+        fwrite($stream, 'a');
+        fwrite($stream, 'b');
+        fwrite($stream, 'c');
+        rewind($stream);
+
+        $this->assertEquals(0, $invoked);
+        $this->assertEquals('abc', stream_get_contents($stream));
+        $this->assertEquals(1, $invoked);
+
+        fclose($stream);
+    }
+
+    public function testOrderCallingAppendAfterPrepend()
+    {
+        $stream = $this->createStream();
+
+        StreamFilter\append($stream, function ($chunk) {
+            return '[' . $chunk . ']';
+        }, STREAM_FILTER_WRITE);
+
+        StreamFilter\prepend($stream, function ($chunk) {
+            return '(' . $chunk . ')';
+        }, STREAM_FILTER_WRITE);
+
+        fwrite($stream, 'hello');
+        rewind($stream);
+
+        $this->assertEquals('[(hello)]', stream_get_contents($stream));
+
+        fclose($stream);
+    }
+
+    public function testRemoveFilter()
+    {
+        $stream = $this->createStream();
+
+        $first = StreamFilter\append($stream, function ($chunk) {
+            return $chunk . '?';
+        }, STREAM_FILTER_WRITE);
+
+        StreamFilter\append($stream, function ($chunk) {
+            return $chunk . '!';
+        }, STREAM_FILTER_WRITE);
+
+        StreamFilter\remove($first);
+
+        fwrite($stream, 'hello');
+        rewind($stream);
+
+        $this->assertEquals('hello!', stream_get_contents($stream));
+
+        fclose($stream);
+    }
+
+    public function testAppendFunDechunk()
+    {
+        if (defined('HHVM_VERSION')) $this->markTestSkipped('Not supported on HHVM (dechunk filter does not exist)');
+
+        $stream = $this->createStream();
+
+        StreamFilter\append($stream, StreamFilter\fun('dechunk'), STREAM_FILTER_WRITE);
+
+        fwrite($stream, "2\r\nhe\r\n");
+        fwrite($stream, "3\r\nllo\r\n");
+        fwrite($stream, "0\r\n\r\n");
+        rewind($stream);
+
+        $this->assertEquals('hello', stream_get_contents($stream));
+
+        fclose($stream);
+    }
+
+    public function testAppendThrows()
+    {
+        $this->createErrorHandler($errors);
+
+        $stream = $this->createStream();
+        $this->createErrorHandler($errors);
+
+        StreamFilter\append($stream, function ($chunk) {
+            throw new \DomainException($chunk);
+        });
+
+        fwrite($stream, 'test');
+
+        $this->removeErrorHandler();
+        $this->assertCount(1, $errors);
+        $this->assertContains('test', $errors[0]);
+    }
+
+    public function testAppendThrowsDuringEnd()
+    {
+        $stream = $this->createStream();
+        $this->createErrorHandler($errors);
+
+        StreamFilter\append($stream, function ($chunk = null) {
+            if ($chunk === null) {
+                throw new \DomainException('end');
+            }
+            return $chunk;
+        });
+
+        fclose($stream);
+
+        $this->removeErrorHandler();
+
+        // We can only assert we're not seeing an exception here…
+        // * php 5.3-5.6 sees one error here
+        // * php 7 does not see any error here
+        // * hhvm sees the same error twice
+        //
+        // If you're curious:
+        //
+        // var_dump($errors);
+        // $this->assertCount(1, $errors);
+        // $this->assertContains('end', $errors[0]);
+    }
+
+    public function testAppendThrowsShouldTriggerEnd()
+    {
+        $stream = $this->createStream();
+        $this->createErrorHandler($errors);
+
+        $ended = false;
+        StreamFilter\append($stream, function ($chunk = null) use (&$ended) {
+            if ($chunk === null) {
+                $ended = true;
+                return '';
+            }
+            throw new \DomainException($chunk);
+        });
+
+        $this->assertEquals(false, $ended);
+        fwrite($stream, 'test');
+        $this->assertEquals(true, $ended);
+
+        $this->removeErrorHandler();
+        $this->assertCount(1, $errors);
+        $this->assertContains('test', $errors[0]);
+    }
+
+    public function testAppendThrowsShouldTriggerEndButIgnoreExceptionDuringEnd()
+    {
+        //$this->markTestIncomplete();
+        $stream = $this->createStream();
+        $this->createErrorHandler($errors);
+
+        StreamFilter\append($stream, function ($chunk = null) {
+            if ($chunk === null) {
+                $chunk = 'end';
+                //return '';
+            }
+            throw new \DomainException($chunk);
+        });
+
+        fwrite($stream, 'test');
+
+        $this->removeErrorHandler();
+        $this->assertCount(1, $errors);
+        $this->assertContains('test', $errors[0]);
+    }
+
+    /**
+     * @expectedException RuntimeException
+     */
+    public function testAppendInvalidStreamIsRuntimeError()
+    {
+        if (defined('HHVM_VERSION')) $this->markTestSkipped('Not supported on HHVM (does not reject invalid stream)');
+        StreamFilter\append(false, function () { });
+    }
+
+    /**
+     * @expectedException RuntimeException
+     */
+    public function testPrependInvalidStreamIsRuntimeError()
+    {
+        if (defined('HHVM_VERSION')) $this->markTestSkipped('Not supported on HHVM (does not reject invalid stream)');
+        StreamFilter\prepend(false, function () { });
+    }
+
+    /**
+     * @expectedException RuntimeException
+     */
+    public function testRemoveInvalidFilterIsRuntimeError()
+    {
+        if (defined('HHVM_VERSION')) $this->markTestSkipped('Not supported on HHVM (does not reject invalid filters)');
+        StreamFilter\remove(false);
+    }
+
+    /**
+     * @expectedException InvalidArgumentException
+     */
+    public function testInvalidCallbackIsInvalidArgument()
+    {
+        $stream = $this->createStream();
+
+        StreamFilter\append($stream, 'a-b-c');
+    }
+
+    private function createStream()
+    {
+        return fopen('php://memory', 'r+');
+    }
+
+    private function createErrorHandler(&$errors)
+    {
+        $errors = array();
+        set_error_handler(function ($_, $message) use (&$errors) {
+            $errors []= $message;
+        });
+    }
+
+    private function removeErrorHandler()
+    {
+        restore_error_handler();
+    }
+}
--- a/plugins/stPayNowPlugin/vendor/clue/stream-filter/tests/FunTest.php
+++ b/plugins/stPayNowPlugin/vendor/clue/stream-filter/tests/FunTest.php
@@ -0,0 +1,61 @@
+<?php
+
+use Clue\StreamFilter as Filter;
+
+class FunTest extends PHPUnit_Framework_TestCase
+{
+    public function testFunInRot13()
+    {
+        $rot = Filter\fun('string.rot13');
+
+        $this->assertEquals('grfg', $rot('test'));
+        $this->assertEquals('test', $rot($rot('test')));
+        $this->assertEquals(null, $rot());
+    }
+
+    public function testFunInQuotedPrintable()
+    {
+        $encode = Filter\fun('convert.quoted-printable-encode');
+        $decode = Filter\fun('convert.quoted-printable-decode');
+
+        $this->assertEquals('t=C3=A4st', $encode('täst'));
+        $this->assertEquals('täst', $decode($encode('täst')));
+        $this->assertEquals(null, $encode());
+    }
+
+    /**
+     * @expectedException RuntimeException
+     */
+    public function testFunWriteAfterCloseRot13()
+    {
+        $rot = Filter\fun('string.rot13');
+
+        $this->assertEquals(null, $rot());
+        $rot('test');
+    }
+
+    /**
+     * @expectedException RuntimeException
+     */
+    public function testFunInvalid()
+    {
+        Filter\fun('unknown');
+    }
+
+    public function testFunInBase64()
+    {
+        $encode = Filter\fun('convert.base64-encode');
+        $decode = Filter\fun('convert.base64-decode');
+
+        $string = 'test';
+        $this->assertEquals(base64_encode($string), $encode($string) . $encode());
+        $this->assertEquals($string, $decode(base64_encode($string)));
+
+        $encode = Filter\fun('convert.base64-encode');
+        $decode = Filter\fun('convert.base64-decode');
+        $this->assertEquals($string, $decode($encode($string) . $encode()));
+
+        $encode = Filter\fun('convert.base64-encode');
+        $this->assertEquals(null, $encode());
+    }
+}
--- a/plugins/stPayNowPlugin/vendor/clue/stream-filter/tests/FunZlibTest.php
+++ b/plugins/stPayNowPlugin/vendor/clue/stream-filter/tests/FunZlibTest.php
@@ -0,0 +1,79 @@
+<?php
+
+use Clue\StreamFilter;
+
+class BuiltInZlibTest extends PHPUnit_Framework_TestCase
+{
+    public function testFunZlibDeflateHelloWorld()
+    {
+        $deflate = StreamFilter\fun('zlib.deflate');
+
+        $data = $deflate('hello') . $deflate(' ') . $deflate('world') . $deflate();
+
+        $this->assertEquals(gzdeflate('hello world'), $data);
+    }
+
+    public function testFunZlibDeflateEmpty()
+    {
+        if (PHP_VERSION >= 7) $this->markTestSkipped('Not supported on PHP7 (empty string does not invoke filter)');
+
+        $deflate = StreamFilter\fun('zlib.deflate');
+
+        //$data = gzdeflate('');
+        $data = $deflate();
+
+        $this->assertEquals("\x03\x00", $data);
+    }
+
+    public function testFunZlibDeflateBig()
+    {
+        $deflate = StreamFilter\fun('zlib.deflate');
+
+        $n = 1000;
+        $expected = str_repeat('hello', $n);
+
+        $bytes = '';
+        for ($i = 0; $i < $n; ++$i) {
+            $bytes .= $deflate('hello');
+        }
+        $bytes .= $deflate();
+
+        $this->assertEquals($expected, gzinflate($bytes));
+    }
+
+    public function testFunZlibInflateHelloWorld()
+    {
+        $inflate = StreamFilter\fun('zlib.inflate');
+
+        $data = $inflate(gzdeflate('hello world')) . $inflate();
+
+        $this->assertEquals('hello world', $data);
+    }
+
+    public function testFunZlibInflateEmpty()
+    {
+        $inflate = StreamFilter\fun('zlib.inflate');
+
+        $data = $inflate("\x03\x00") . $inflate();
+
+        $this->assertEquals('', $data);
+    }
+
+    public function testFunZlibInflateBig()
+    {
+        if (defined('HHVM_VERSION')) $this->markTestSkipped('Not supported on HHVM (final chunk will not be emitted)');
+
+        $inflate = StreamFilter\fun('zlib.inflate');
+
+        $expected = str_repeat('hello', 10);
+        $bytes = gzdeflate($expected);
+
+        $ret = '';
+        foreach (str_split($bytes, 2) as $chunk) {
+            $ret .= $inflate($chunk);
+        }
+        $ret .= $inflate();
+
+        $this->assertEquals($expected, $ret);
+    }
+}
--- a/plugins/stPayNowPlugin/vendor/composer/ClassLoader.php
+++ b/plugins/stPayNowPlugin/vendor/composer/ClassLoader.php
@@ -0,0 +1,445 @@
+<?php
+
+/*
+ * This file is part of Composer.
+ *
+ * (c) Nils Adermann <naderman@naderman.de>
+ *     Jordi Boggiano <j.boggiano@seld.be>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Composer\Autoload;
+
+/**
+ * ClassLoader implements a PSR-0, PSR-4 and classmap class loader.
+ *
+ *     $loader = new \Composer\Autoload\ClassLoader();
+ *
+ *     // register classes with namespaces
+ *     $loader->add('Symfony\Component', __DIR__.'/component');
+ *     $loader->add('Symfony',           __DIR__.'/framework');
+ *
+ *     // activate the autoloader
+ *     $loader->register();
+ *
+ *     // to enable searching the include path (eg. for PEAR packages)
+ *     $loader->setUseIncludePath(true);
+ *
+ * In this example, if you try to use a class in the Symfony\Component
+ * namespace or one of its children (Symfony\Component\Console for instance),
+ * the autoloader will first look for the class under the component/
+ * directory, and it will then fallback to the framework/ directory if not
+ * found before giving up.
+ *
+ * This class is loosely based on the Symfony UniversalClassLoader.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ * @author Jordi Boggiano <j.boggiano@seld.be>
+ * @see    https://www.php-fig.org/psr/psr-0/
+ * @see    https://www.php-fig.org/psr/psr-4/
+ */
+class ClassLoader
+{
+    // PSR-4
+    private $prefixLengthsPsr4 = array();
+    private $prefixDirsPsr4 = array();
+    private $fallbackDirsPsr4 = array();
+
+    // PSR-0
+    private $prefixesPsr0 = array();
+    private $fallbackDirsPsr0 = array();
+
+    private $useIncludePath = false;
+    private $classMap = array();
+    private $classMapAuthoritative = false;
+    private $missingClasses = array();
+    private $apcuPrefix;
+
+    public function getPrefixes()
+    {
+        if (!empty($this->prefixesPsr0)) {
+            return call_user_func_array('array_merge', array_values($this->prefixesPsr0));
+        }
+
+        return array();
+    }
+
+    public function getPrefixesPsr4()
+    {
+        return $this->prefixDirsPsr4;
+    }
+
+    public function getFallbackDirs()
+    {
+        return $this->fallbackDirsPsr0;
+    }
+
+    public function getFallbackDirsPsr4()
+    {
+        return $this->fallbackDirsPsr4;
+    }
+
+    public function getClassMap()
+    {
+        return $this->classMap;
+    }
+
+    /**
+     * @param array $classMap Class to filename map
+     */
+    public function addClassMap(array $classMap)
+    {
+        if ($this->classMap) {
+            $this->classMap = array_merge($this->classMap, $classMap);
+        } else {
+            $this->classMap = $classMap;
+        }
+    }
+
+    /**
+     * Registers a set of PSR-0 directories for a given prefix, either
+     * appending or prepending to the ones previously set for this prefix.
+     *
+     * @param string       $prefix  The prefix
+     * @param array|string $paths   The PSR-0 root directories
+     * @param bool         $prepend Whether to prepend the directories
+     */
+    public function add($prefix, $paths, $prepend = false)
+    {
+        if (!$prefix) {
+            if ($prepend) {
+                $this->fallbackDirsPsr0 = array_merge(
+                    (array) $paths,
+                    $this->fallbackDirsPsr0
+                );
+            } else {
+                $this->fallbackDirsPsr0 = array_merge(
+                    $this->fallbackDirsPsr0,
+                    (array) $paths
+                );
+            }
+
+            return;
+        }
+
+        $first = $prefix[0];
+        if (!isset($this->prefixesPsr0[$first][$prefix])) {
+            $this->prefixesPsr0[$first][$prefix] = (array) $paths;
+
+            return;
+        }
+        if ($prepend) {
+            $this->prefixesPsr0[$first][$prefix] = array_merge(
+                (array) $paths,
+                $this->prefixesPsr0[$first][$prefix]
+            );
+        } else {
+            $this->prefixesPsr0[$first][$prefix] = array_merge(
+                $this->prefixesPsr0[$first][$prefix],
+                (array) $paths
+            );
+        }
+    }
+
+    /**
+     * Registers a set of PSR-4 directories for a given namespace, either
+     * appending or prepending to the ones previously set for this namespace.
+     *
+     * @param string       $prefix  The prefix/namespace, with trailing '\\'
+     * @param array|string $paths   The PSR-4 base directories
+     * @param bool         $prepend Whether to prepend the directories
+     *
+     * @throws \InvalidArgumentException
+     */
+    public function addPsr4($prefix, $paths, $prepend = false)
+    {
+        if (!$prefix) {
+            // Register directories for the root namespace.
+            if ($prepend) {
+                $this->fallbackDirsPsr4 = array_merge(
+                    (array) $paths,
+                    $this->fallbackDirsPsr4
+                );
+            } else {
+                $this->fallbackDirsPsr4 = array_merge(
+                    $this->fallbackDirsPsr4,
+                    (array) $paths
+                );
+            }
+        } elseif (!isset($this->prefixDirsPsr4[$prefix])) {
+            // Register directories for a new namespace.
+            $length = strlen($prefix);
+            if ('\\' !== $prefix[$length - 1]) {
+                throw new \InvalidArgumentException("A non-empty PSR-4 prefix must end with a namespace separator.");
+            }
+            $this->prefixLengthsPsr4[$prefix[0]][$prefix] = $length;
+            $this->prefixDirsPsr4[$prefix] = (array) $paths;
+        } elseif ($prepend) {
+            // Prepend directories for an already registered namespace.
+            $this->prefixDirsPsr4[$prefix] = array_merge(
+                (array) $paths,
+                $this->prefixDirsPsr4[$prefix]
+            );
+        } else {
+            // Append directories for an already registered namespace.
+            $this->prefixDirsPsr4[$prefix] = array_merge(
+                $this->prefixDirsPsr4[$prefix],
+                (array) $paths
+            );
+        }
+    }
+
+    /**
+     * Registers a set of PSR-0 directories for a given prefix,
+     * replacing any others previously set for this prefix.
+     *
+     * @param string       $prefix The prefix
+     * @param array|string $paths  The PSR-0 base directories
+     */
+    public function set($prefix, $paths)
+    {
+        if (!$prefix) {
+            $this->fallbackDirsPsr0 = (array) $paths;
+        } else {
+            $this->prefixesPsr0[$prefix[0]][$prefix] = (array) $paths;
+        }
+    }
+
+    /**
+     * Registers a set of PSR-4 directories for a given namespace,
+     * replacing any others previously set for this namespace.
+     *
+     * @param string       $prefix The prefix/namespace, with trailing '\\'
+     * @param array|string $paths  The PSR-4 base directories
+     *
+     * @throws \InvalidArgumentException
+     */
+    public function setPsr4($prefix, $paths)
+    {
+        if (!$prefix) {
+            $this->fallbackDirsPsr4 = (array) $paths;
+        } else {
+            $length = strlen($prefix);
+            if ('\\' !== $prefix[$length - 1]) {
+                throw new \InvalidArgumentException("A non-empty PSR-4 prefix must end with a namespace separator.");
+            }
+            $this->prefixLengthsPsr4[$prefix[0]][$prefix] = $length;
+            $this->prefixDirsPsr4[$prefix] = (array) $paths;
+        }
+    }
+
+    /**
+     * Turns on searching the include path for class files.
+     *
+     * @param bool $useIncludePath
+     */
+    public function setUseIncludePath($useIncludePath)
+    {
+        $this->useIncludePath = $useIncludePath;
+    }
+
+    /**
+     * Can be used to check if the autoloader uses the include path to check
+     * for classes.
+     *
+     * @return bool
+     */
+    public function getUseIncludePath()
+    {
+        return $this->useIncludePath;
+    }
+
+    /**
+     * Turns off searching the prefix and fallback directories for classes
+     * that have not been registered with the class map.
+     *
+     * @param bool $classMapAuthoritative
+     */
+    public function setClassMapAuthoritative($classMapAuthoritative)
+    {
+        $this->classMapAuthoritative = $classMapAuthoritative;
+    }
+
+    /**
+     * Should class lookup fail if not found in the current class map?
+     *
+     * @return bool
+     */
+    public function isClassMapAuthoritative()
+    {
+        return $this->classMapAuthoritative;
+    }
+
+    /**
+     * APCu prefix to use to cache found/not-found classes, if the extension is enabled.
+     *
+     * @param string|null $apcuPrefix
+     */
+    public function setApcuPrefix($apcuPrefix)
+    {
+        $this->apcuPrefix = function_exists('apcu_fetch') && filter_var(ini_get('apc.enabled'), FILTER_VALIDATE_BOOLEAN) ? $apcuPrefix : null;
+    }
+
+    /**
+     * The APCu prefix in use, or null if APCu caching is not enabled.
+     *
+     * @return string|null
+     */
+    public function getApcuPrefix()
+    {
+        return $this->apcuPrefix;
+    }
+
+    /**
+     * Registers this instance as an autoloader.
+     *
+     * @param bool $prepend Whether to prepend the autoloader or not
+     */
+    public function register($prepend = false)
+    {
+        spl_autoload_register(array($this, 'loadClass'), true, $prepend);
+    }
+
+    /**
+     * Unregisters this instance as an autoloader.
+     */
+    public function unregister()
+    {
+        spl_autoload_unregister(array($this, 'loadClass'));
+    }
+
+    /**
+     * Loads the given class or interface.
+     *
+     * @param  string    $class The name of the class
+     * @return bool|null True if loaded, null otherwise
+     */
+    public function loadClass($class)
+    {
+        if ($file = $this->findFile($class)) {
+            includeFile($file);
+
+            return true;
+        }
+    }
+
+    /**
+     * Finds the path to the file where the class is defined.
+     *
+     * @param string $class The name of the class
+     *
+     * @return string|false The path if found, false otherwise
+     */
+    public function findFile($class)
+    {
+        // class map lookup
+        if (isset($this->classMap[$class])) {
+            return $this->classMap[$class];
+        }
+        if ($this->classMapAuthoritative || isset($this->missingClasses[$class])) {
+            return false;
+        }
+        if (null !== $this->apcuPrefix) {
+            $file = apcu_fetch($this->apcuPrefix.$class, $hit);
+            if ($hit) {
+                return $file;
+            }
+        }
+
+        $file = $this->findFileWithExtension($class, '.php');
+
+        // Search for Hack files if we are running on HHVM
+        if (false === $file && defined('HHVM_VERSION')) {
+            $file = $this->findFileWithExtension($class, '.hh');
+        }
+
+        if (null !== $this->apcuPrefix) {
+            apcu_add($this->apcuPrefix.$class, $file);
+        }
+
+        if (false === $file) {
+            // Remember that this class does not exist.
+            $this->missingClasses[$class] = true;
+        }
+
+        return $file;
+    }
+
+    private function findFileWithExtension($class, $ext)
+    {
+        // PSR-4 lookup
+        $logicalPathPsr4 = strtr($class, '\\', DIRECTORY_SEPARATOR) . $ext;
+
+        $first = $class[0];
+        if (isset($this->prefixLengthsPsr4[$first])) {
+            $subPath = $class;
+            while (false !== $lastPos = strrpos($subPath, '\\')) {
+                $subPath = substr($subPath, 0, $lastPos);
+                $search = $subPath . '\\';
+                if (isset($this->prefixDirsPsr4[$search])) {
+                    $pathEnd = DIRECTORY_SEPARATOR . substr($logicalPathPsr4, $lastPos + 1);
+                    foreach ($this->prefixDirsPsr4[$search] as $dir) {
+                        if (file_exists($file = $dir . $pathEnd)) {
+                            return $file;
+                        }
+                    }
+                }
+            }
+        }
+
+        // PSR-4 fallback dirs
+        foreach ($this->fallbackDirsPsr4 as $dir) {
+            if (file_exists($file = $dir . DIRECTORY_SEPARATOR . $logicalPathPsr4)) {
+                return $file;
+            }
+        }
+
+        // PSR-0 lookup
+        if (false !== $pos = strrpos($class, '\\')) {
+            // namespaced class name
+            $logicalPathPsr0 = substr($logicalPathPsr4, 0, $pos + 1)
+                . strtr(substr($logicalPathPsr4, $pos + 1), '_', DIRECTORY_SEPARATOR);
+        } else {
+            // PEAR-like class name
+            $logicalPathPsr0 = strtr($class, '_', DIRECTORY_SEPARATOR) . $ext;
+        }
+
+        if (isset($this->prefixesPsr0[$first])) {
+            foreach ($this->prefixesPsr0[$first] as $prefix => $dirs) {
+                if (0 === strpos($class, $prefix)) {
+                    foreach ($dirs as $dir) {
+                        if (file_exists($file = $dir . DIRECTORY_SEPARATOR . $logicalPathPsr0)) {
+                            return $file;
+                        }
+                    }
+                }
+            }
+        }
+
+        // PSR-0 fallback dirs
+        foreach ($this->fallbackDirsPsr0 as $dir) {
+            if (file_exists($file = $dir . DIRECTORY_SEPARATOR . $logicalPathPsr0)) {
+                return $file;
+            }
+        }
+
+        // PSR-0 include paths.
+        if ($this->useIncludePath && $file = stream_resolve_include_path($logicalPathPsr0)) {
+            return $file;
+        }
+
+        return false;
+    }
+}
+
+/**
+ * Scope isolated include.
+ *
+ * Prevents access to $this/self from included files.
+ */
+function includeFile($file)
+{
+    include $file;
+}
--- a/plugins/stPayNowPlugin/vendor/composer/InstalledVersions.php
+++ b/plugins/stPayNowPlugin/vendor/composer/InstalledVersions.php
@@ -0,0 +1,336 @@
+<?php
+
+namespace Composer;
+
+use Composer\Semver\VersionParser;
+
+
+
+
+
+
+class InstalledVersions
+{
+private static $installed = array (
+  'root' => 
+  array (
+    'pretty_version' => '1.0.0+no-version-set',
+    'version' => '1.0.0.0',
+    'aliases' => 
+    array (
+    ),
+    'reference' => NULL,
+    'name' => '__root__',
+  ),
+  'versions' => 
+  array (
+    '__root__' => 
+    array (
+      'pretty_version' => '1.0.0+no-version-set',
+      'version' => '1.0.0.0',
+      'aliases' => 
+      array (
+      ),
+      'reference' => NULL,
+    ),
+    'clue/stream-filter' => 
+    array (
+      'pretty_version' => 'v1.5.0',
+      'version' => '1.5.0.0',
+      'aliases' => 
+      array (
+      ),
+      'reference' => 'aeb7d8ea49c7963d3b581378955dbf5bc49aa320',
+    ),
+    'guzzlehttp/psr7' => 
+    array (
+      'pretty_version' => '1.7.0',
+      'version' => '1.7.0.0',
+      'aliases' => 
+      array (
+      ),
+      'reference' => '53330f47520498c0ae1f61f7e2c90f55690c06a3',
+    ),
+    'pay-now/paynow-php-sdk' => 
+    array (
+      'pretty_version' => '1.1.0',
+      'version' => '1.1.0.0',
+      'aliases' => 
+      array (
+      ),
+      'reference' => '88291e5b804a432e2a2cf47e664a90231febd3db',
+    ),
+    'php-http/async-client-implementation' => 
+    array (
+      'provided' => 
+      array (
+        0 => '1.0',
+      ),
+    ),
+    'php-http/client-implementation' => 
+    array (
+      'provided' => 
+      array (
+        0 => '1.0',
+      ),
+    ),
+    'php-http/curl-client' => 
+    array (
+      'pretty_version' => 'v1.7.1',
+      'version' => '1.7.1.0',
+      'aliases' => 
+      array (
+      ),
+      'reference' => '6341a93d00e5d953fc868a3928b5167e6513f2b6',
+    ),
+    'php-http/discovery' => 
+    array (
+      'pretty_version' => '1.13.0',
+      'version' => '1.13.0.0',
+      'aliases' => 
+      array (
+      ),
+      'reference' => '788f72d64c43dc361e7fcc7464c3d947c64984a7',
+    ),
+    'php-http/httplug' => 
+    array (
+      'pretty_version' => 'v1.1.0',
+      'version' => '1.1.0.0',
+      'aliases' => 
+      array (
+      ),
+      'reference' => '1c6381726c18579c4ca2ef1ec1498fdae8bdf018',
+    ),
+    'php-http/message' => 
+    array (
+      'pretty_version' => '1.10.0',
+      'version' => '1.10.0.0',
+      'aliases' => 
+      array (
+      ),
+      'reference' => '39db36d5972e9e6d00ea852b650953f928d8f10d',
+    ),
+    'php-http/message-factory' => 
+    array (
+      'pretty_version' => 'v1.0.2',
+      'version' => '1.0.2.0',
+      'aliases' => 
+      array (
+      ),
+      'reference' => 'a478cb11f66a6ac48d8954216cfed9aa06a501a1',
+    ),
+    'php-http/message-factory-implementation' => 
+    array (
+      'provided' => 
+      array (
+        0 => '1.0',
+      ),
+    ),
+    'php-http/promise' => 
+    array (
+      'pretty_version' => '1.1.0',
+      'version' => '1.1.0.0',
+      'aliases' => 
+      array (
+      ),
+      'reference' => '4c4c1f9b7289a2ec57cde7f1e9762a5789506f88',
+    ),
+    'psr/http-message' => 
+    array (
+      'pretty_version' => '1.0.1',
+      'version' => '1.0.1.0',
+      'aliases' => 
+      array (
+      ),
+      'reference' => 'f6561bf28d520154e4b0ec72be95418abe6d9363',
+    ),
+    'psr/http-message-implementation' => 
+    array (
+      'provided' => 
+      array (
+        0 => '1.0',
+      ),
+    ),
+    'ralouphie/getallheaders' => 
+    array (
+      'pretty_version' => '3.0.3',
+      'version' => '3.0.3.0',
+      'aliases' => 
+      array (
+      ),
+      'reference' => '120b605dfeb996808c31b6477290a714d356e822',
+    ),
+  ),
+);
+
+
+
+
+
+
+
+public static function getInstalledPackages()
+{
+return array_keys(self::$installed['versions']);
+}
+
+
+
+
+
+
+
+
+
+public static function isInstalled($packageName)
+{
+return isset(self::$installed['versions'][$packageName]);
+}
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+public static function satisfies(VersionParser $parser, $packageName, $constraint)
+{
+$constraint = $parser->parseConstraints($constraint);
+$provided = $parser->parseConstraints(self::getVersionRanges($packageName));
+
+return $provided->matches($constraint);
+}
+
+
+
+
+
+
+
+
+
+
+public static function getVersionRanges($packageName)
+{
+if (!isset(self::$installed['versions'][$packageName])) {
+throw new \OutOfBoundsException('Package "' . $packageName . '" is not installed');
+}
+
+$ranges = array();
+if (isset(self::$installed['versions'][$packageName]['pretty_version'])) {
+$ranges[] = self::$installed['versions'][$packageName]['pretty_version'];
+}
+if (array_key_exists('aliases', self::$installed['versions'][$packageName])) {
+$ranges = array_merge($ranges, self::$installed['versions'][$packageName]['aliases']);
+}
+if (array_key_exists('replaced', self::$installed['versions'][$packageName])) {
+$ranges = array_merge($ranges, self::$installed['versions'][$packageName]['replaced']);
+}
+if (array_key_exists('provided', self::$installed['versions'][$packageName])) {
+$ranges = array_merge($ranges, self::$installed['versions'][$packageName]['provided']);
+}
+
+return implode(' || ', $ranges);
+}
+
+
+
+
+
+public static function getVersion($packageName)
+{
+if (!isset(self::$installed['versions'][$packageName])) {
+throw new \OutOfBoundsException('Package "' . $packageName . '" is not installed');
+}
+
+if (!isset(self::$installed['versions'][$packageName]['version'])) {
+return null;
+}
+
+return self::$installed['versions'][$packageName]['version'];
+}
+
+
+
+
+
+public static function getPrettyVersion($packageName)
+{
+if (!isset(self::$installed['versions'][$packageName])) {
+throw new \OutOfBoundsException('Package "' . $packageName . '" is not installed');
+}
+
+if (!isset(self::$installed['versions'][$packageName]['pretty_version'])) {
+return null;
+}
+
+return self::$installed['versions'][$packageName]['pretty_version'];
+}
+
+
+
+
+
+public static function getReference($packageName)
+{
+if (!isset(self::$installed['versions'][$packageName])) {
+throw new \OutOfBoundsException('Package "' . $packageName . '" is not installed');
+}
+
+if (!isset(self::$installed['versions'][$packageName]['reference'])) {
+return null;
+}
+
+return self::$installed['versions'][$packageName]['reference'];
+}
+
+
+
+
+
+public static function getRootPackage()
+{
+return self::$installed['root'];
+}
+
+
+
+
+
+
+
+public static function getRawData()
+{
+return self::$installed;
+}
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+public static function reload($data)
+{
+self::$installed = $data;
+}
+}
--- a/plugins/stPayNowPlugin/vendor/composer/LICENSE
+++ b/plugins/stPayNowPlugin/vendor/composer/LICENSE
@@ -0,0 +1,21 @@
+
+Copyright (c) Nils Adermann, Jordi Boggiano
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is furnished
+to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+
--- a/plugins/stPayNowPlugin/vendor/composer/autoload_classmap.php
+++ b/plugins/stPayNowPlugin/vendor/composer/autoload_classmap.php
@@ -0,0 +1,10 @@
+<?php
+
+// autoload_classmap.php @generated by Composer
+
+$vendorDir = dirname(dirname(__FILE__));
+$baseDir = dirname($vendorDir);
+
+return array(
+    'Composer\\InstalledVersions' => $vendorDir . '/composer/InstalledVersions.php',
+);
--- a/plugins/stPayNowPlugin/vendor/composer/autoload_files.php
+++ b/plugins/stPayNowPlugin/vendor/composer/autoload_files.php
@@ -0,0 +1,13 @@
+<?php
+
+// autoload_files.php @generated by Composer
+
+$vendorDir = dirname(dirname(__FILE__));
+$baseDir = dirname($vendorDir);
+
+return array(
+    '7b11c4dc42b3b3023073cb14e519683c' => $vendorDir . '/ralouphie/getallheaders/src/getallheaders.php',
+    'a0edc8309cc5e1d60e3047b5df6b7052' => $vendorDir . '/guzzlehttp/psr7/src/functions_include.php',
+    '9c67151ae59aff4788964ce8eb2a0f43' => $vendorDir . '/clue/stream-filter/src/functions_include.php',
+    '8cff32064859f4559445b89279f3199c' => $vendorDir . '/php-http/message/src/filters.php',
+);
--- a/plugins/stPayNowPlugin/vendor/composer/autoload_namespaces.php
+++ b/plugins/stPayNowPlugin/vendor/composer/autoload_namespaces.php
@@ -0,0 +1,9 @@
+<?php
+
+// autoload_namespaces.php @generated by Composer
+
+$vendorDir = dirname(dirname(__FILE__));
+$baseDir = dirname($vendorDir);
+
+return array(
+);
--- a/plugins/stPayNowPlugin/vendor/composer/autoload_psr4.php
+++ b/plugins/stPayNowPlugin/vendor/composer/autoload_psr4.php
@@ -0,0 +1,19 @@
+<?php
+
+// autoload_psr4.php @generated by Composer
+
+$vendorDir = dirname(dirname(__FILE__));
+$baseDir = dirname($vendorDir);
+
+return array(
+    'Psr\\Http\\Message\\' => array($vendorDir . '/psr/http-message/src'),
+    'Paynow\\Tests\\' => array($vendorDir . '/pay-now/paynow-php-sdk/tests'),
+    'Paynow\\' => array($vendorDir . '/pay-now/paynow-php-sdk/src/Paynow'),
+    'Http\\Promise\\' => array($vendorDir . '/php-http/promise/src'),
+    'Http\\Message\\' => array($vendorDir . '/php-http/message-factory/src', $vendorDir . '/php-http/message/src'),
+    'Http\\Discovery\\' => array($vendorDir . '/php-http/discovery/src'),
+    'Http\\Client\\Curl\\' => array($vendorDir . '/php-http/curl-client/src'),
+    'Http\\Client\\' => array($vendorDir . '/php-http/httplug/src'),
+    'GuzzleHttp\\Psr7\\' => array($vendorDir . '/guzzlehttp/psr7/src'),
+    'Clue\\StreamFilter\\' => array($vendorDir . '/clue/stream-filter/src'),
+);
--- a/plugins/stPayNowPlugin/vendor/composer/autoload_real.php
+++ b/plugins/stPayNowPlugin/vendor/composer/autoload_real.php
@@ -0,0 +1,75 @@
+<?php
+
+// autoload_real.php @generated by Composer
+
+class ComposerAutoloaderInitb1af4a2473faf4faf0fc0314fc29a6e4
+{
+    private static $loader;
+
+    public static function loadClassLoader($class)
+    {
+        if ('Composer\Autoload\ClassLoader' === $class) {
+            require __DIR__ . '/ClassLoader.php';
+        }
+    }
+
+    /**
+     * @return \Composer\Autoload\ClassLoader
+     */
+    public static function getLoader()
+    {
+        if (null !== self::$loader) {
+            return self::$loader;
+        }
+
+        require __DIR__ . '/platform_check.php';
+
+        spl_autoload_register(array('ComposerAutoloaderInitb1af4a2473faf4faf0fc0314fc29a6e4', 'loadClassLoader'), true, true);
+        self::$loader = $loader = new \Composer\Autoload\ClassLoader();
+        spl_autoload_unregister(array('ComposerAutoloaderInitb1af4a2473faf4faf0fc0314fc29a6e4', 'loadClassLoader'));
+
+        $useStaticLoader = PHP_VERSION_ID >= 50600 && !defined('HHVM_VERSION') && (!function_exists('zend_loader_file_encoded') || !zend_loader_file_encoded());
+        if ($useStaticLoader) {
+            require __DIR__ . '/autoload_static.php';
+
+            call_user_func(\Composer\Autoload\ComposerStaticInitb1af4a2473faf4faf0fc0314fc29a6e4::getInitializer($loader));
+        } else {
+            $map = require __DIR__ . '/autoload_namespaces.php';
+            foreach ($map as $namespace => $path) {
+                $loader->set($namespace, $path);
+            }
+
+            $map = require __DIR__ . '/autoload_psr4.php';
+            foreach ($map as $namespace => $path) {
+                $loader->setPsr4($namespace, $path);
+            }
+
+            $classMap = require __DIR__ . '/autoload_classmap.php';
+            if ($classMap) {
+                $loader->addClassMap($classMap);
+            }
+        }
+
+        $loader->register(true);
+
+        if ($useStaticLoader) {
+            $includeFiles = Composer\Autoload\ComposerStaticInitb1af4a2473faf4faf0fc0314fc29a6e4::$files;
+        } else {
+            $includeFiles = require __DIR__ . '/autoload_files.php';
+        }
+        foreach ($includeFiles as $fileIdentifier => $file) {
+            composerRequireb1af4a2473faf4faf0fc0314fc29a6e4($fileIdentifier, $file);
+        }
+
+        return $loader;
+    }
+}
+
+function composerRequireb1af4a2473faf4faf0fc0314fc29a6e4($fileIdentifier, $file)
+{
+    if (empty($GLOBALS['__composer_autoload_files'][$fileIdentifier])) {
+        require $file;
+
+        $GLOBALS['__composer_autoload_files'][$fileIdentifier] = true;
+    }
+}
--- a/plugins/stPayNowPlugin/vendor/composer/autoload_static.php
+++ b/plugins/stPayNowPlugin/vendor/composer/autoload_static.php
@@ -0,0 +1,98 @@
+<?php
+
+// autoload_static.php @generated by Composer
+
+namespace Composer\Autoload;
+
+class ComposerStaticInitb1af4a2473faf4faf0fc0314fc29a6e4
+{
+    public static $files = array (
+        '7b11c4dc42b3b3023073cb14e519683c' => __DIR__ . '/..' . '/ralouphie/getallheaders/src/getallheaders.php',
+        'a0edc8309cc5e1d60e3047b5df6b7052' => __DIR__ . '/..' . '/guzzlehttp/psr7/src/functions_include.php',
+        '9c67151ae59aff4788964ce8eb2a0f43' => __DIR__ . '/..' . '/clue/stream-filter/src/functions_include.php',
+        '8cff32064859f4559445b89279f3199c' => __DIR__ . '/..' . '/php-http/message/src/filters.php',
+    );
+
+    public static $prefixLengthsPsr4 = array (
+        'P' => 
+        array (
+            'Psr\\Http\\Message\\' => 17,
+            'Paynow\\Tests\\' => 13,
+            'Paynow\\' => 7,
+        ),
+        'H' => 
+        array (
+            'Http\\Promise\\' => 13,
+            'Http\\Message\\' => 13,
+            'Http\\Discovery\\' => 15,
+            'Http\\Client\\Curl\\' => 17,
+            'Http\\Client\\' => 12,
+        ),
+        'G' => 
+        array (
+            'GuzzleHttp\\Psr7\\' => 16,
+        ),
+        'C' => 
+        array (
+            'Clue\\StreamFilter\\' => 18,
+        ),
+    );
+
+    public static $prefixDirsPsr4 = array (
+        'Psr\\Http\\Message\\' => 
+        array (
+            0 => __DIR__ . '/..' . '/psr/http-message/src',
+        ),
+        'Paynow\\Tests\\' => 
+        array (
+            0 => __DIR__ . '/..' . '/pay-now/paynow-php-sdk/tests',
+        ),
+        'Paynow\\' => 
+        array (
+            0 => __DIR__ . '/..' . '/pay-now/paynow-php-sdk/src/Paynow',
+        ),
+        'Http\\Promise\\' => 
+        array (
+            0 => __DIR__ . '/..' . '/php-http/promise/src',
+        ),
+        'Http\\Message\\' => 
+        array (
+            0 => __DIR__ . '/..' . '/php-http/message-factory/src',
+            1 => __DIR__ . '/..' . '/php-http/message/src',
+        ),
+        'Http\\Discovery\\' => 
+        array (
+            0 => __DIR__ . '/..' . '/php-http/discovery/src',
+        ),
+        'Http\\Client\\Curl\\' => 
+        array (
+            0 => __DIR__ . '/..' . '/php-http/curl-client/src',
+        ),
+        'Http\\Client\\' => 
+        array (
+            0 => __DIR__ . '/..' . '/php-http/httplug/src',
+        ),
+        'GuzzleHttp\\Psr7\\' => 
+        array (
+            0 => __DIR__ . '/..' . '/guzzlehttp/psr7/src',
+        ),
+        'Clue\\StreamFilter\\' => 
+        array (
+            0 => __DIR__ . '/..' . '/clue/stream-filter/src',
+        ),
+    );
+
+    public static $classMap = array (
+        'Composer\\InstalledVersions' => __DIR__ . '/..' . '/composer/InstalledVersions.php',
+    );
+
+    public static function getInitializer(ClassLoader $loader)
+    {
+        return \Closure::bind(function () use ($loader) {
+            $loader->prefixLengthsPsr4 = ComposerStaticInitb1af4a2473faf4faf0fc0314fc29a6e4::$prefixLengthsPsr4;
+            $loader->prefixDirsPsr4 = ComposerStaticInitb1af4a2473faf4faf0fc0314fc29a6e4::$prefixDirsPsr4;
+            $loader->classMap = ComposerStaticInitb1af4a2473faf4faf0fc0314fc29a6e4::$classMap;
+
+        }, null, ClassLoader::class);
+    }
+}
--- a/plugins/stPayNowPlugin/vendor/composer/installed.json
+++ b/plugins/stPayNowPlugin/vendor/composer/installed.json
@@ -0,0 +1,693 @@
+{
+    "packages": [
+        {
+            "name": "clue/stream-filter",
+            "version": "v1.5.0",
+            "version_normalized": "1.5.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/clue/php-stream-filter.git",
+                "reference": "aeb7d8ea49c7963d3b581378955dbf5bc49aa320"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/clue/php-stream-filter/zipball/aeb7d8ea49c7963d3b581378955dbf5bc49aa320",
+                "reference": "aeb7d8ea49c7963d3b581378955dbf5bc49aa320",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^9.3 || ^5.7 || ^4.8.36"
+            },
+            "time": "2020-10-02T12:38:20+00:00",
+            "type": "library",
+            "installation-source": "dist",
+            "autoload": {
+                "psr-4": {
+                    "Clue\\StreamFilter\\": "src/"
+                },
+                "files": [
+                    "src/functions_include.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Christian Lück",
+                    "email": "christian@clue.engineering"
+                }
+            ],
+            "description": "A simple and modern approach to stream filtering in PHP",
+            "homepage": "https://github.com/clue/php-stream-filter",
+            "keywords": [
+                "bucket brigade",
+                "callback",
+                "filter",
+                "php_user_filter",
+                "stream",
+                "stream_filter_append",
+                "stream_filter_register"
+            ],
+            "support": {
+                "issues": "https://github.com/clue/php-stream-filter/issues",
+                "source": "https://github.com/clue/php-stream-filter/tree/v1.5.0"
+            },
+            "funding": [
+                {
+                    "url": "https://clue.engineering/support",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/clue",
+                    "type": "github"
+                }
+            ],
+            "install-path": "../clue/stream-filter"
+        },
+        {
+            "name": "guzzlehttp/psr7",
+            "version": "1.7.0",
+            "version_normalized": "1.7.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/guzzle/psr7.git",
+                "reference": "53330f47520498c0ae1f61f7e2c90f55690c06a3"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/guzzle/psr7/zipball/53330f47520498c0ae1f61f7e2c90f55690c06a3",
+                "reference": "53330f47520498c0ae1f61f7e2c90f55690c06a3",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.4.0",
+                "psr/http-message": "~1.0",
+                "ralouphie/getallheaders": "^2.0.5 || ^3.0.0"
+            },
+            "provide": {
+                "psr/http-message-implementation": "1.0"
+            },
+            "require-dev": {
+                "ext-zlib": "*",
+                "phpunit/phpunit": "~4.8.36 || ^5.7.27 || ^6.5.14 || ^7.5.20 || ^8.5.8 || ^9.3.10"
+            },
+            "suggest": {
+                "laminas/laminas-httphandlerrunner": "Emit PSR-7 responses"
+            },
+            "time": "2020-09-30T07:37:11+00:00",
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.7-dev"
+                }
+            },
+            "installation-source": "dist",
+            "autoload": {
+                "psr-4": {
+                    "GuzzleHttp\\Psr7\\": "src/"
+                },
+                "files": [
+                    "src/functions_include.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Michael Dowling",
+                    "email": "mtdowling@gmail.com",
+                    "homepage": "https://github.com/mtdowling"
+                },
+                {
+                    "name": "Tobias Schultze",
+                    "homepage": "https://github.com/Tobion"
+                }
+            ],
+            "description": "PSR-7 message implementation that also provides common utility methods",
+            "keywords": [
+                "http",
+                "message",
+                "psr-7",
+                "request",
+                "response",
+                "stream",
+                "uri",
+                "url"
+            ],
+            "support": {
+                "issues": "https://github.com/guzzle/psr7/issues",
+                "source": "https://github.com/guzzle/psr7/tree/1.7.0"
+            },
+            "install-path": "../guzzlehttp/psr7"
+        },
+        {
+            "name": "pay-now/paynow-php-sdk",
+            "version": "1.1.0",
+            "version_normalized": "1.1.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/pay-now/paynow-php-sdk.git",
+                "reference": "88291e5b804a432e2a2cf47e664a90231febd3db"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/pay-now/paynow-php-sdk/zipball/88291e5b804a432e2a2cf47e664a90231febd3db",
+                "reference": "88291e5b804a432e2a2cf47e664a90231febd3db",
+                "shasum": ""
+            },
+            "require": {
+                "ext-curl": "*",
+                "ext-json": "*",
+                "guzzlehttp/psr7": "^1.6",
+                "php": "^5.6 || ~7.0",
+                "php-http/curl-client": "^1.7",
+                "php-http/message": "^1.7"
+            },
+            "require-dev": {
+                "dealerdirect/phpcodesniffer-composer-installer": "^0.5.0",
+                "friendsofphp/php-cs-fixer": "^2.15",
+                "php-http/mock-client": "^1.3",
+                "phpcompatibility/php-compatibility": "^9.3",
+                "phpunit/phpunit": "^5.7",
+                "squizlabs/php_codesniffer": "^3.4"
+            },
+            "time": "2020-11-26T12:23:33+00:00",
+            "type": "library",
+            "installation-source": "dist",
+            "autoload": {
+                "psr-4": {
+                    "Paynow\\": "src/Paynow/",
+                    "Paynow\\Tests\\": "tests"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "mBank S.A.",
+                    "email": "kontakt@paynow.pl"
+                }
+            ],
+            "description": "PHP client library for accessing Paynow API",
+            "homepage": "https://www.paynow.pl",
+            "keywords": [
+                "api",
+                "mbank",
+                "payment processing",
+                "paynow"
+            ],
+            "support": {
+                "issues": "https://github.com/pay-now/paynow-php-sdk/issues",
+                "source": "https://github.com/pay-now/paynow-php-sdk/tree/v1.1.0"
+            },
+            "install-path": "../pay-now/paynow-php-sdk"
+        },
+        {
+            "name": "php-http/curl-client",
+            "version": "v1.7.1",
+            "version_normalized": "1.7.1.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/php-http/curl-client.git",
+                "reference": "6341a93d00e5d953fc868a3928b5167e6513f2b6"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/php-http/curl-client/zipball/6341a93d00e5d953fc868a3928b5167e6513f2b6",
+                "reference": "6341a93d00e5d953fc868a3928b5167e6513f2b6",
+                "shasum": ""
+            },
+            "require": {
+                "ext-curl": "*",
+                "php": "^5.5 || ^7.0",
+                "php-http/discovery": "^1.0",
+                "php-http/httplug": "^1.0",
+                "php-http/message": "^1.2",
+                "php-http/message-factory": "^1.0.2"
+            },
+            "provide": {
+                "php-http/async-client-implementation": "1.0",
+                "php-http/client-implementation": "1.0"
+            },
+            "require-dev": {
+                "guzzlehttp/psr7": "^1.0",
+                "php-http/client-integration-tests": "^0.6",
+                "phpunit/phpunit": "^4.8.27",
+                "zendframework/zend-diactoros": "^1.0"
+            },
+            "time": "2018-03-26T19:21:48+00:00",
+            "type": "library",
+            "installation-source": "dist",
+            "autoload": {
+                "psr-4": {
+                    "Http\\Client\\Curl\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Михаил Красильников",
+                    "email": "m.krasilnikov@yandex.ru"
+                }
+            ],
+            "description": "cURL client for PHP-HTTP",
+            "homepage": "http://php-http.org",
+            "keywords": [
+                "curl",
+                "http"
+            ],
+            "install-path": "../php-http/curl-client"
+        },
+        {
+            "name": "php-http/discovery",
+            "version": "1.13.0",
+            "version_normalized": "1.13.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/php-http/discovery.git",
+                "reference": "788f72d64c43dc361e7fcc7464c3d947c64984a7"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/php-http/discovery/zipball/788f72d64c43dc361e7fcc7464c3d947c64984a7",
+                "reference": "788f72d64c43dc361e7fcc7464c3d947c64984a7",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.1 || ^8.0"
+            },
+            "conflict": {
+                "nyholm/psr7": "<1.0"
+            },
+            "require-dev": {
+                "graham-campbell/phpspec-skip-example-extension": "^5.0",
+                "php-http/httplug": "^1.0 || ^2.0",
+                "php-http/message-factory": "^1.0",
+                "phpspec/phpspec": "^5.1 || ^6.1",
+                "puli/composer-plugin": "1.0.0-beta10"
+            },
+            "suggest": {
+                "php-http/message": "Allow to use Guzzle, Diactoros or Slim Framework factories",
+                "puli/composer-plugin": "Sets up Puli which is recommended for Discovery to work. Check http://docs.php-http.org/en/latest/discovery.html for more details."
+            },
+            "time": "2020-11-27T14:49:42+00:00",
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.9-dev"
+                }
+            },
+            "installation-source": "dist",
+            "autoload": {
+                "psr-4": {
+                    "Http\\Discovery\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Márk Sági-Kazár",
+                    "email": "mark.sagikazar@gmail.com"
+                }
+            ],
+            "description": "Finds installed HTTPlug implementations and PSR-7 message factories",
+            "homepage": "http://php-http.org",
+            "keywords": [
+                "adapter",
+                "client",
+                "discovery",
+                "factory",
+                "http",
+                "message",
+                "psr7"
+            ],
+            "support": {
+                "issues": "https://github.com/php-http/discovery/issues",
+                "source": "https://github.com/php-http/discovery/tree/1.13.0"
+            },
+            "install-path": "../php-http/discovery"
+        },
+        {
+            "name": "php-http/httplug",
+            "version": "v1.1.0",
+            "version_normalized": "1.1.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/php-http/httplug.git",
+                "reference": "1c6381726c18579c4ca2ef1ec1498fdae8bdf018"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/php-http/httplug/zipball/1c6381726c18579c4ca2ef1ec1498fdae8bdf018",
+                "reference": "1c6381726c18579c4ca2ef1ec1498fdae8bdf018",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.4",
+                "php-http/promise": "^1.0",
+                "psr/http-message": "^1.0"
+            },
+            "require-dev": {
+                "henrikbjorn/phpspec-code-coverage": "^1.0",
+                "phpspec/phpspec": "^2.4"
+            },
+            "time": "2016-08-31T08:30:17+00:00",
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.1-dev"
+                }
+            },
+            "installation-source": "dist",
+            "autoload": {
+                "psr-4": {
+                    "Http\\Client\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Eric GELOEN",
+                    "email": "geloen.eric@gmail.com"
+                },
+                {
+                    "name": "Márk Sági-Kazár",
+                    "email": "mark.sagikazar@gmail.com"
+                }
+            ],
+            "description": "HTTPlug, the HTTP client abstraction for PHP",
+            "homepage": "http://httplug.io",
+            "keywords": [
+                "client",
+                "http"
+            ],
+            "install-path": "../php-http/httplug"
+        },
+        {
+            "name": "php-http/message",
+            "version": "1.10.0",
+            "version_normalized": "1.10.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/php-http/message.git",
+                "reference": "39db36d5972e9e6d00ea852b650953f928d8f10d"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/php-http/message/zipball/39db36d5972e9e6d00ea852b650953f928d8f10d",
+                "reference": "39db36d5972e9e6d00ea852b650953f928d8f10d",
+                "shasum": ""
+            },
+            "require": {
+                "clue/stream-filter": "^1.5",
+                "php": "^7.1 || ^8.0",
+                "php-http/message-factory": "^1.0.2",
+                "psr/http-message": "^1.0"
+            },
+            "provide": {
+                "php-http/message-factory-implementation": "1.0"
+            },
+            "require-dev": {
+                "ergebnis/composer-normalize": "^2.6",
+                "ext-zlib": "*",
+                "guzzlehttp/psr7": "^1.0",
+                "phpspec/phpspec": "^5.1 || ^6.3",
+                "slim/slim": "^3.0",
+                "zendframework/zend-diactoros": "^1.0"
+            },
+            "suggest": {
+                "ext-zlib": "Used with compressor/decompressor streams",
+                "guzzlehttp/psr7": "Used with Guzzle PSR-7 Factories",
+                "slim/slim": "Used with Slim Framework PSR-7 implementation",
+                "zendframework/zend-diactoros": "Used with Diactoros Factories"
+            },
+            "time": "2020-11-11T10:19:56+00:00",
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.10-dev"
+                }
+            },
+            "installation-source": "dist",
+            "autoload": {
+                "psr-4": {
+                    "Http\\Message\\": "src/"
+                },
+                "files": [
+                    "src/filters.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Márk Sági-Kazár",
+                    "email": "mark.sagikazar@gmail.com"
+                }
+            ],
+            "description": "HTTP Message related tools",
+            "homepage": "http://php-http.org",
+            "keywords": [
+                "http",
+                "message",
+                "psr-7"
+            ],
+            "support": {
+                "issues": "https://github.com/php-http/message/issues",
+                "source": "https://github.com/php-http/message/tree/1.10.0"
+            },
+            "install-path": "../php-http/message"
+        },
+        {
+            "name": "php-http/message-factory",
+            "version": "v1.0.2",
+            "version_normalized": "1.0.2.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/php-http/message-factory.git",
+                "reference": "a478cb11f66a6ac48d8954216cfed9aa06a501a1"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/php-http/message-factory/zipball/a478cb11f66a6ac48d8954216cfed9aa06a501a1",
+                "reference": "a478cb11f66a6ac48d8954216cfed9aa06a501a1",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.4",
+                "psr/http-message": "^1.0"
+            },
+            "time": "2015-12-19T14:08:53+00:00",
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.0-dev"
+                }
+            },
+            "installation-source": "dist",
+            "autoload": {
+                "psr-4": {
+                    "Http\\Message\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Márk Sági-Kazár",
+                    "email": "mark.sagikazar@gmail.com"
+                }
+            ],
+            "description": "Factory interfaces for PSR-7 HTTP Message",
+            "homepage": "http://php-http.org",
+            "keywords": [
+                "factory",
+                "http",
+                "message",
+                "stream",
+                "uri"
+            ],
+            "install-path": "../php-http/message-factory"
+        },
+        {
+            "name": "php-http/promise",
+            "version": "1.1.0",
+            "version_normalized": "1.1.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/php-http/promise.git",
+                "reference": "4c4c1f9b7289a2ec57cde7f1e9762a5789506f88"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/php-http/promise/zipball/4c4c1f9b7289a2ec57cde7f1e9762a5789506f88",
+                "reference": "4c4c1f9b7289a2ec57cde7f1e9762a5789506f88",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.1 || ^8.0"
+            },
+            "require-dev": {
+                "friends-of-phpspec/phpspec-code-coverage": "^4.3.2",
+                "phpspec/phpspec": "^5.1.2 || ^6.2"
+            },
+            "time": "2020-07-07T09:29:14+00:00",
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.1-dev"
+                }
+            },
+            "installation-source": "dist",
+            "autoload": {
+                "psr-4": {
+                    "Http\\Promise\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Joel Wurtz",
+                    "email": "joel.wurtz@gmail.com"
+                },
+                {
+                    "name": "Márk Sági-Kazár",
+                    "email": "mark.sagikazar@gmail.com"
+                }
+            ],
+            "description": "Promise used for asynchronous HTTP requests",
+            "homepage": "http://httplug.io",
+            "keywords": [
+                "promise"
+            ],
+            "support": {
+                "issues": "https://github.com/php-http/promise/issues",
+                "source": "https://github.com/php-http/promise/tree/1.1.0"
+            },
+            "install-path": "../php-http/promise"
+        },
+        {
+            "name": "psr/http-message",
+            "version": "1.0.1",
+            "version_normalized": "1.0.1.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/php-fig/http-message.git",
+                "reference": "f6561bf28d520154e4b0ec72be95418abe6d9363"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/php-fig/http-message/zipball/f6561bf28d520154e4b0ec72be95418abe6d9363",
+                "reference": "f6561bf28d520154e4b0ec72be95418abe6d9363",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3.0"
+            },
+            "time": "2016-08-06T14:39:51+00:00",
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.0.x-dev"
+                }
+            },
+            "installation-source": "dist",
+            "autoload": {
+                "psr-4": {
+                    "Psr\\Http\\Message\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "PHP-FIG",
+                    "homepage": "http://www.php-fig.org/"
+                }
+            ],
+            "description": "Common interface for HTTP messages",
+            "homepage": "https://github.com/php-fig/http-message",
+            "keywords": [
+                "http",
+                "http-message",
+                "psr",
+                "psr-7",
+                "request",
+                "response"
+            ],
+            "install-path": "../psr/http-message"
+        },
+        {
+            "name": "ralouphie/getallheaders",
+            "version": "3.0.3",
+            "version_normalized": "3.0.3.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/ralouphie/getallheaders.git",
+                "reference": "120b605dfeb996808c31b6477290a714d356e822"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/ralouphie/getallheaders/zipball/120b605dfeb996808c31b6477290a714d356e822",
+                "reference": "120b605dfeb996808c31b6477290a714d356e822",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.6"
+            },
+            "require-dev": {
+                "php-coveralls/php-coveralls": "^2.1",
+                "phpunit/phpunit": "^5 || ^6.5"
+            },
+            "time": "2019-03-08T08:55:37+00:00",
+            "type": "library",
+            "installation-source": "dist",
+            "autoload": {
+                "files": [
+                    "src/getallheaders.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Ralph Khattar",
+                    "email": "ralph.khattar@gmail.com"
+                }
+            ],
+            "description": "A polyfill for getallheaders.",
+            "install-path": "../ralouphie/getallheaders"
+        }
+    ],
+    "dev": true,
+    "dev-package-names": []
+}
--- a/plugins/stPayNowPlugin/vendor/composer/installed.php
+++ b/plugins/stPayNowPlugin/vendor/composer/installed.php
@@ -0,0 +1,151 @@
+<?php return array (
+  'root' => 
+  array (
+    'pretty_version' => '1.0.0+no-version-set',
+    'version' => '1.0.0.0',
+    'aliases' => 
+    array (
+    ),
+    'reference' => NULL,
+    'name' => '__root__',
+  ),
+  'versions' => 
+  array (
+    '__root__' => 
+    array (
+      'pretty_version' => '1.0.0+no-version-set',
+      'version' => '1.0.0.0',
+      'aliases' => 
+      array (
+      ),
+      'reference' => NULL,
+    ),
+    'clue/stream-filter' => 
+    array (
+      'pretty_version' => 'v1.5.0',
+      'version' => '1.5.0.0',
+      'aliases' => 
+      array (
+      ),
+      'reference' => 'aeb7d8ea49c7963d3b581378955dbf5bc49aa320',
+    ),
+    'guzzlehttp/psr7' => 
+    array (
+      'pretty_version' => '1.7.0',
+      'version' => '1.7.0.0',
+      'aliases' => 
+      array (
+      ),
+      'reference' => '53330f47520498c0ae1f61f7e2c90f55690c06a3',
+    ),
+    'pay-now/paynow-php-sdk' => 
+    array (
+      'pretty_version' => '1.1.0',
+      'version' => '1.1.0.0',
+      'aliases' => 
+      array (
+      ),
+      'reference' => '88291e5b804a432e2a2cf47e664a90231febd3db',
+    ),
+    'php-http/async-client-implementation' => 
+    array (
+      'provided' => 
+      array (
+        0 => '1.0',
+      ),
+    ),
+    'php-http/client-implementation' => 
+    array (
+      'provided' => 
+      array (
+        0 => '1.0',
+      ),
+    ),
+    'php-http/curl-client' => 
+    array (
+      'pretty_version' => 'v1.7.1',
+      'version' => '1.7.1.0',
+      'aliases' => 
+      array (
+      ),
+      'reference' => '6341a93d00e5d953fc868a3928b5167e6513f2b6',
+    ),
+    'php-http/discovery' => 
+    array (
+      'pretty_version' => '1.13.0',
+      'version' => '1.13.0.0',
+      'aliases' => 
+      array (
+      ),
+      'reference' => '788f72d64c43dc361e7fcc7464c3d947c64984a7',
+    ),
+    'php-http/httplug' => 
+    array (
+      'pretty_version' => 'v1.1.0',
+      'version' => '1.1.0.0',
+      'aliases' => 
+      array (
+      ),
+      'reference' => '1c6381726c18579c4ca2ef1ec1498fdae8bdf018',
+    ),
+    'php-http/message' => 
+    array (
+      'pretty_version' => '1.10.0',
+      'version' => '1.10.0.0',
+      'aliases' => 
+      array (
+      ),
+      'reference' => '39db36d5972e9e6d00ea852b650953f928d8f10d',
+    ),
+    'php-http/message-factory' => 
+    array (
+      'pretty_version' => 'v1.0.2',
+      'version' => '1.0.2.0',
+      'aliases' => 
+      array (
+      ),
+      'reference' => 'a478cb11f66a6ac48d8954216cfed9aa06a501a1',
+    ),
+    'php-http/message-factory-implementation' => 
+    array (
+      'provided' => 
+      array (
+        0 => '1.0',
+      ),
+    ),
+    'php-http/promise' => 
+    array (
+      'pretty_version' => '1.1.0',
+      'version' => '1.1.0.0',
+      'aliases' => 
+      array (
+      ),
+      'reference' => '4c4c1f9b7289a2ec57cde7f1e9762a5789506f88',
+    ),
+    'psr/http-message' => 
+    array (
+      'pretty_version' => '1.0.1',
+      'version' => '1.0.1.0',
+      'aliases' => 
+      array (
+      ),
+      'reference' => 'f6561bf28d520154e4b0ec72be95418abe6d9363',
+    ),
+    'psr/http-message-implementation' => 
+    array (
+      'provided' => 
+      array (
+        0 => '1.0',
+      ),
+    ),
+    'ralouphie/getallheaders' => 
+    array (
+      'pretty_version' => '3.0.3',
+      'version' => '3.0.3.0',
+      'aliases' => 
+      array (
+      ),
+      'reference' => '120b605dfeb996808c31b6477290a714d356e822',
+    ),
+  ),
+);
--- a/plugins/stPayNowPlugin/vendor/composer/platform_check.php
+++ b/plugins/stPayNowPlugin/vendor/composer/platform_check.php
@@ -0,0 +1,26 @@
+<?php
+
+// platform_check.php @generated by Composer
+
+$issues = array();
+
+if (!(PHP_VERSION_ID >= 70100)) {
+    $issues[] = 'Your Composer dependencies require a PHP version ">= 7.1.0". You are running ' . PHP_VERSION . '.';
+}
+
+if ($issues) {
+    if (!headers_sent()) {
+        header('HTTP/1.1 500 Internal Server Error');
+    }
+    if (!ini_get('display_errors')) {
+        if (PHP_SAPI === 'cli' || PHP_SAPI === 'phpdbg') {
+            fwrite(STDERR, 'Composer detected issues in your platform:' . PHP_EOL.PHP_EOL . implode(PHP_EOL, $issues) . PHP_EOL.PHP_EOL);
+        } elseif (!headers_sent()) {
+            echo 'Composer detected issues in your platform:' . PHP_EOL.PHP_EOL . str_replace('You are running '.PHP_VERSION.'.', '', implode(PHP_EOL, $issues)) . PHP_EOL.PHP_EOL;
+        }
+    }
+    trigger_error(
+        'Composer detected issues in your platform: ' . implode(' ', $issues),
+        E_USER_ERROR
+    );
+}
--- a/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/CHANGELOG.md
+++ b/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/CHANGELOG.md
@@ -0,0 +1,270 @@
+# Change Log
+
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
+and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
+
+
+## [Unreleased]
+
+## [1.7.0] - 2020-09-30
+
+### Added
+
+- Replaced functions by static methods
+
+### Fixed
+
+- Converting a non-seekable stream to a string
+- Handle multiple Set-Cookie correctly
+- Ignore array keys in header values when merging
+- Allow multibyte characters to be parsed in `Message:bodySummary()`
+
+### Changed
+
+- Restored partial HHVM 3 support
+
+
+## [1.6.1] - 2019-07-02
+
+### Fixed
+
+- Accept null and bool header values again
+
+
+## [1.6.0] - 2019-06-30
+
+### Added
+
+- Allowed version `^3.0` of `ralouphie/getallheaders` dependency (#244)
+- Added MIME type for WEBP image format (#246)
+- Added more validation of values according to PSR-7 and RFC standards, e.g. status code range (#250, #272)
+
+### Changed
+
+- Tests don't pass with HHVM 4.0, so HHVM support got dropped. Other libraries like composer have done the same. (#262)
+- Accept port number 0 to be valid (#270)
+
+### Fixed
+
+- Fixed subsequent reads from `php://input` in ServerRequest (#247)
+- Fixed readable/writable detection for certain stream modes (#248)
+- Fixed encoding of special characters in the `userInfo` component of an URI (#253)
+
+
+## [1.5.2] - 2018-12-04
+
+### Fixed
+
+- Check body size when getting the message summary
+
+
+## [1.5.1] - 2018-12-04
+
+### Fixed
+
+- Get the summary of a body only if it is readable
+
+
+## [1.5.0] - 2018-12-03
+
+### Added
+
+- Response first-line to response string exception (fixes #145)
+- A test for #129 behavior
+- `get_message_body_summary` function in order to get the message summary
+- `3gp` and `mkv` mime types
+
+### Changed
+
+- Clarify exception message when stream is detached
+
+### Deprecated
+
+- Deprecated parsing folded header lines as per RFC 7230
+
+### Fixed
+
+- Fix `AppendStream::detach` to not close streams
+- `InflateStream` preserves `isSeekable` attribute of the underlying stream
+- `ServerRequest::getUriFromGlobals` to support URLs in query parameters
+
+
+Several other fixes and improvements.
+
+
+## [1.4.2] - 2017-03-20
+
+### Fixed
+
+- Reverted BC break to `Uri::resolve` and `Uri::removeDotSegments` by removing
+  calls to `trigger_error` when deprecated methods are invoked.
+
+
+## [1.4.1] - 2017-02-27
+
+### Added
+
+- Rriggering of silenced deprecation warnings.
+
+### Fixed
+
+- Reverted BC break by reintroducing behavior to automagically fix a URI with a
+  relative path and an authority by adding a leading slash to the path. It's only
+  deprecated now.
+
+
+## [1.4.0] - 2017-02-21
+
+### Added
+
+- Added common URI utility methods based on RFC 3986 (see documentation in the readme):
+  - `Uri::isDefaultPort`
+  - `Uri::isAbsolute`
+  - `Uri::isNetworkPathReference`
+  - `Uri::isAbsolutePathReference`
+  - `Uri::isRelativePathReference`
+  - `Uri::isSameDocumentReference`
+  - `Uri::composeComponents`
+  - `UriNormalizer::normalize`
+  - `UriNormalizer::isEquivalent`
+  - `UriResolver::relativize`
+
+### Changed
+
+- Ensure `ServerRequest::getUriFromGlobals` returns a URI in absolute form.
+- Allow `parse_response` to parse a response without delimiting space and reason.
+- Ensure each URI modification results in a valid URI according to PSR-7 discussions.
+  Invalid modifications will throw an exception instead of returning a wrong URI or
+  doing some magic.
+  - `(new Uri)->withPath('foo')->withHost('example.com')` will throw an exception
+    because the path of a URI with an authority must start with a slash "/" or be empty
+  - `(new Uri())->withScheme('http')` will return `'http://localhost'`
+
+### Deprecated
+
+- `Uri::resolve` in favor of `UriResolver::resolve`
+- `Uri::removeDotSegments` in favor of `UriResolver::removeDotSegments`
+
+### Fixed
+
+- `Stream::read` when length parameter <= 0.
+- `copy_to_stream` reads bytes in chunks instead of `maxLen` into memory.
+- `ServerRequest::getUriFromGlobals` when `Host` header contains port.
+- Compatibility of URIs with `file` scheme and empty host.
+
+
+## [1.3.1] - 2016-06-25
+
+### Fixed
+
+- `Uri::__toString` for network path references, e.g. `//example.org`.
+- Missing lowercase normalization for host.
+- Handling of URI components in case they are `'0'` in a lot of places,
+  e.g. as a user info password.
+- `Uri::withAddedHeader` to correctly merge headers with different case.
+- Trimming of header values in `Uri::withAddedHeader`. Header values may
+  be surrounded by whitespace which should be ignored according to RFC 7230
+  Section 3.2.4. This does not apply to header names.
+- `Uri::withAddedHeader` with an array of header values.
+- `Uri::resolve` when base path has no slash and handling of fragment.
+- Handling of encoding in `Uri::with(out)QueryValue` so one can pass the
+  key/value both in encoded as well as decoded form to those methods. This is
+  consistent with withPath, withQuery etc.
+- `ServerRequest::withoutAttribute` when attribute value is null.
+
+
+## [1.3.0] - 2016-04-13
+
+### Added
+
+- Remaining interfaces needed for full PSR7 compatibility
+  (ServerRequestInterface, UploadedFileInterface, etc.).
+- Support for stream_for from scalars.
+
+### Changed
+
+- Can now extend Uri.
+
+### Fixed
+- A bug in validating request methods by making it more permissive.
+
+
+## [1.2.3] - 2016-02-18
+
+### Fixed
+
+- Support in `GuzzleHttp\Psr7\CachingStream` for seeking forward on remote
+  streams, which can sometimes return fewer bytes than requested with `fread`.
+- Handling of gzipped responses with FNAME headers.
+
+
+## [1.2.2] - 2016-01-22
+
+### Added
+
+- Support for URIs without any authority.
+- Support for HTTP 451 'Unavailable For Legal Reasons.'
+- Support for using '0' as a filename.
+- Support for including non-standard ports in Host headers.
+
+
+## [1.2.1] - 2015-11-02
+
+### Changes
+
+- Now supporting negative offsets when seeking to SEEK_END.
+
+
+## [1.2.0] - 2015-08-15
+
+### Changed
+
+- Body as `"0"` is now properly added to a response.
+- Now allowing forward seeking in CachingStream.
+- Now properly parsing HTTP requests that contain proxy targets in
+  `parse_request`.
+- functions.php is now conditionally required.
+- user-info is no longer dropped when resolving URIs.
+
+
+## [1.1.0] - 2015-06-24
+
+### Changed
+
+- URIs can now be relative.
+- `multipart/form-data` headers are now overridden case-insensitively.
+- URI paths no longer encode the following characters because they are allowed
+  in URIs: "(", ")", "*", "!", "'"
+- A port is no longer added to a URI when the scheme is missing and no port is
+  present.
+
+
+## 1.0.0 - 2015-05-19
+
+Initial release.
+
+Currently unsupported:
+
+- `Psr\Http\Message\ServerRequestInterface`
+- `Psr\Http\Message\UploadedFileInterface`
+
+
+
+[Unreleased]: https://github.com/guzzle/psr7/compare/1.6.0...HEAD
+[1.6.0]: https://github.com/guzzle/psr7/compare/1.5.2...1.6.0
+[1.5.2]: https://github.com/guzzle/psr7/compare/1.5.1...1.5.2
+[1.5.1]: https://github.com/guzzle/psr7/compare/1.5.0...1.5.1
+[1.5.0]: https://github.com/guzzle/psr7/compare/1.4.2...1.5.0
+[1.4.2]: https://github.com/guzzle/psr7/compare/1.4.1...1.4.2
+[1.4.1]: https://github.com/guzzle/psr7/compare/1.4.0...1.4.1
+[1.4.0]: https://github.com/guzzle/psr7/compare/1.3.1...1.4.0
+[1.3.1]: https://github.com/guzzle/psr7/compare/1.3.0...1.3.1
+[1.3.0]: https://github.com/guzzle/psr7/compare/1.2.3...1.3.0
+[1.2.3]: https://github.com/guzzle/psr7/compare/1.2.2...1.2.3
+[1.2.2]: https://github.com/guzzle/psr7/compare/1.2.1...1.2.2
+[1.2.1]: https://github.com/guzzle/psr7/compare/1.2.0...1.2.1
+[1.2.0]: https://github.com/guzzle/psr7/compare/1.1.0...1.2.0
+[1.1.0]: https://github.com/guzzle/psr7/compare/1.0.0...1.1.0
--- a/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/LICENSE
+++ b/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/LICENSE
@@ -0,0 +1,19 @@
+Copyright (c) 2015 Michael Dowling, https://github.com/mtdowling <mtdowling@gmail.com>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
--- a/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/README.md
+++ b/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/README.md
@@ -0,0 +1,809 @@
+# PSR-7 Message Implementation
+
+This repository contains a full [PSR-7](http://www.php-fig.org/psr/psr-7/)
+message implementation, several stream decorators, and some helpful
+functionality like query string parsing.
+
+
+[![Build Status](https://travis-ci.org/guzzle/psr7.svg?branch=master)](https://travis-ci.org/guzzle/psr7)
+
+
+# Stream implementation
+
+This package comes with a number of stream implementations and stream
+decorators.
+
+
+## AppendStream
+
+`GuzzleHttp\Psr7\AppendStream`
+
+Reads from multiple streams, one after the other.
+
+```php
+use GuzzleHttp\Psr7;
+
+$a = Psr7\Utils::streamFor('abc, ');
+$b = Psr7\Utils::streamFor('123.');
+$composed = new Psr7\AppendStream([$a, $b]);
+
+$composed->addStream(Psr7\Utils::streamFor(' Above all listen to me'));
+
+echo $composed; // abc, 123. Above all listen to me.
+```
+
+
+## BufferStream
+
+`GuzzleHttp\Psr7\BufferStream`
+
+Provides a buffer stream that can be written to fill a buffer, and read
+from to remove bytes from the buffer.
+
+This stream returns a "hwm" metadata value that tells upstream consumers
+what the configured high water mark of the stream is, or the maximum
+preferred size of the buffer.
+
+```php
+use GuzzleHttp\Psr7;
+
+// When more than 1024 bytes are in the buffer, it will begin returning
+// false to writes. This is an indication that writers should slow down.
+$buffer = new Psr7\BufferStream(1024);
+```
+
+
+## CachingStream
+
+The CachingStream is used to allow seeking over previously read bytes on
+non-seekable streams. This can be useful when transferring a non-seekable
+entity body fails due to needing to rewind the stream (for example, resulting
+from a redirect). Data that is read from the remote stream will be buffered in
+a PHP temp stream so that previously read bytes are cached first in memory,
+then on disk.
+
+```php
+use GuzzleHttp\Psr7;
+
+$original = Psr7\Utils::streamFor(fopen('http://www.google.com', 'r'));
+$stream = new Psr7\CachingStream($original);
+
+$stream->read(1024);
+echo $stream->tell();
+// 1024
+
+$stream->seek(0);
+echo $stream->tell();
+// 0
+```
+
+
+## DroppingStream
+
+`GuzzleHttp\Psr7\DroppingStream`
+
+Stream decorator that begins dropping data once the size of the underlying
+stream becomes too full.
+
+```php
+use GuzzleHttp\Psr7;
+
+// Create an empty stream
+$stream = Psr7\Utils::streamFor();
+
+// Start dropping data when the stream has more than 10 bytes
+$dropping = new Psr7\DroppingStream($stream, 10);
+
+$dropping->write('01234567890123456789');
+echo $stream; // 0123456789
+```
+
+
+## FnStream
+
+`GuzzleHttp\Psr7\FnStream`
+
+Compose stream implementations based on a hash of functions.
+
+Allows for easy testing and extension of a provided stream without needing
+to create a concrete class for a simple extension point.
+
+```php
+
+use GuzzleHttp\Psr7;
+
+$stream = Psr7\Utils::streamFor('hi');
+$fnStream = Psr7\FnStream::decorate($stream, [
+    'rewind' => function () use ($stream) {
+        echo 'About to rewind - ';
+        $stream->rewind();
+        echo 'rewound!';
+    }
+]);
+
+$fnStream->rewind();
+// Outputs: About to rewind - rewound!
+```
+
+
+## InflateStream
+
+`GuzzleHttp\Psr7\InflateStream`
+
+Uses PHP's zlib.inflate filter to inflate deflate or gzipped content.
+
+This stream decorator skips the first 10 bytes of the given stream to remove
+the gzip header, converts the provided stream to a PHP stream resource,
+then appends the zlib.inflate filter. The stream is then converted back
+to a Guzzle stream resource to be used as a Guzzle stream.
+
+
+## LazyOpenStream
+
+`GuzzleHttp\Psr7\LazyOpenStream`
+
+Lazily reads or writes to a file that is opened only after an IO operation
+take place on the stream.
+
+```php
+use GuzzleHttp\Psr7;
+
+$stream = new Psr7\LazyOpenStream('/path/to/file', 'r');
+// The file has not yet been opened...
+
+echo $stream->read(10);
+// The file is opened and read from only when needed.
+```
+
+
+## LimitStream
+
+`GuzzleHttp\Psr7\LimitStream`
+
+LimitStream can be used to read a subset or slice of an existing stream object.
+This can be useful for breaking a large file into smaller pieces to be sent in
+chunks (e.g. Amazon S3's multipart upload API).
+
+```php
+use GuzzleHttp\Psr7;
+
+$original = Psr7\Utils::streamFor(fopen('/tmp/test.txt', 'r+'));
+echo $original->getSize();
+// >>> 1048576
+
+// Limit the size of the body to 1024 bytes and start reading from byte 2048
+$stream = new Psr7\LimitStream($original, 1024, 2048);
+echo $stream->getSize();
+// >>> 1024
+echo $stream->tell();
+// >>> 0
+```
+
+
+## MultipartStream
+
+`GuzzleHttp\Psr7\MultipartStream`
+
+Stream that when read returns bytes for a streaming multipart or
+multipart/form-data stream.
+
+
+## NoSeekStream
+
+`GuzzleHttp\Psr7\NoSeekStream`
+
+NoSeekStream wraps a stream and does not allow seeking.
+
+```php
+use GuzzleHttp\Psr7;
+
+$original = Psr7\Utils::streamFor('foo');
+$noSeek = new Psr7\NoSeekStream($original);
+
+echo $noSeek->read(3);
+// foo
+var_export($noSeek->isSeekable());
+// false
+$noSeek->seek(0);
+var_export($noSeek->read(3));
+// NULL
+```
+
+
+## PumpStream
+
+`GuzzleHttp\Psr7\PumpStream`
+
+Provides a read only stream that pumps data from a PHP callable.
+
+When invoking the provided callable, the PumpStream will pass the amount of
+data requested to read to the callable. The callable can choose to ignore
+this value and return fewer or more bytes than requested. Any extra data
+returned by the provided callable is buffered internally until drained using
+the read() function of the PumpStream. The provided callable MUST return
+false when there is no more data to read.
+
+
+## Implementing stream decorators
+
+Creating a stream decorator is very easy thanks to the
+`GuzzleHttp\Psr7\StreamDecoratorTrait`. This trait provides methods that
+implement `Psr\Http\Message\StreamInterface` by proxying to an underlying
+stream. Just `use` the `StreamDecoratorTrait` and implement your custom
+methods.
+
+For example, let's say we wanted to call a specific function each time the last
+byte is read from a stream. This could be implemented by overriding the
+`read()` method.
+
+```php
+use Psr\Http\Message\StreamInterface;
+use GuzzleHttp\Psr7\StreamDecoratorTrait;
+
+class EofCallbackStream implements StreamInterface
+{
+    use StreamDecoratorTrait;
+
+    private $callback;
+
+    public function __construct(StreamInterface $stream, callable $cb)
+    {
+        $this->stream = $stream;
+        $this->callback = $cb;
+    }
+
+    public function read($length)
+    {
+        $result = $this->stream->read($length);
+
+        // Invoke the callback when EOF is hit.
+        if ($this->eof()) {
+            call_user_func($this->callback);
+        }
+
+        return $result;
+    }
+}
+```
+
+This decorator could be added to any existing stream and used like so:
+
+```php
+use GuzzleHttp\Psr7;
+
+$original = Psr7\Utils::streamFor('foo');
+
+$eofStream = new EofCallbackStream($original, function () {
+    echo 'EOF!';
+});
+
+$eofStream->read(2);
+$eofStream->read(1);
+// echoes "EOF!"
+$eofStream->seek(0);
+$eofStream->read(3);
+// echoes "EOF!"
+```
+
+
+## PHP StreamWrapper
+
+You can use the `GuzzleHttp\Psr7\StreamWrapper` class if you need to use a
+PSR-7 stream as a PHP stream resource.
+
+Use the `GuzzleHttp\Psr7\StreamWrapper::getResource()` method to create a PHP
+stream from a PSR-7 stream.
+
+```php
+use GuzzleHttp\Psr7\StreamWrapper;
+
+$stream = GuzzleHttp\Psr7\Utils::streamFor('hello!');
+$resource = StreamWrapper::getResource($stream);
+echo fread($resource, 6); // outputs hello!
+```
+
+
+# Static API
+
+There are various static methods available under the `GuzzleHttp\Psr7` namespace.
+
+
+## `GuzzleHttp\Psr7\Message::toString`
+
+`public static function toString(MessageInterface $message): string`
+
+Returns the string representation of an HTTP message.
+
+```php
+$request = new GuzzleHttp\Psr7\Request('GET', 'http://example.com');
+echo GuzzleHttp\Psr7\Message::toString($request);
+```
+
+
+## `GuzzleHttp\Psr7\Message::bodySummary`
+
+`public static function bodySummary(MessageInterface $message, int $truncateAt = 120): string|null`
+
+Get a short summary of the message body.
+
+Will return `null` if the response is not printable.
+
+
+## `GuzzleHttp\Psr7\Message::rewindBody`
+
+`public static function rewindBody(MessageInterface $message): void`
+
+Attempts to rewind a message body and throws an exception on failure.
+
+The body of the message will only be rewound if a call to `tell()`
+returns a value other than `0`.
+
+
+## `GuzzleHttp\Psr7\Message::parseMessage`
+
+`public static function parseMessage(string $message): array`
+
+Parses an HTTP message into an associative array.
+
+The array contains the "start-line" key containing the start line of
+the message, "headers" key containing an associative array of header
+array values, and a "body" key containing the body of the message.
+
+
+## `GuzzleHttp\Psr7\Message::parseRequestUri`
+
+`public static function parseRequestUri(string $path, array $headers): string`
+
+Constructs a URI for an HTTP request message.
+
+
+## `GuzzleHttp\Psr7\Message::parseRequest`
+
+`public static function parseRequest(string $message): Request`
+
+Parses a request message string into a request object.
+
+
+## `GuzzleHttp\Psr7\Message::parseResponse`
+
+`public static function parseResponse(string $message): Response`
+
+Parses a response message string into a response object.
+
+
+## `GuzzleHttp\Psr7\Header::parse`
+
+`public static function parse(string|array $header): array`
+
+Parse an array of header values containing ";" separated data into an
+array of associative arrays representing the header key value pair data
+of the header. When a parameter does not contain a value, but just
+contains a key, this function will inject a key with a '' string value.
+
+
+## `GuzzleHttp\Psr7\Header::normalize`
+
+`public static function normalize(string|array $header): array`
+
+Converts an array of header values that may contain comma separated
+headers into an array of headers with no comma separated values.
+
+
+## `GuzzleHttp\Psr7\Query::parse`
+
+`public static function parse(string $str, int|bool $urlEncoding = true): array`
+
+Parse a query string into an associative array.
+
+If multiple values are found for the same key, the value of that key
+value pair will become an array. This function does not parse nested
+PHP style arrays into an associative array (e.g., `foo[a]=1&foo[b]=2`
+will be parsed into `['foo[a]' => '1', 'foo[b]' => '2'])`.
+
+
+## `GuzzleHttp\Psr7\Query::build`
+
+`public static function build(array $params, int|false $encoding = PHP_QUERY_RFC3986): string`
+
+Build a query string from an array of key value pairs.
+
+This function can use the return value of `parse()` to build a query
+string. This function does not modify the provided keys when an array is
+encountered (like `http_build_query()` would).
+
+
+## `GuzzleHttp\Psr7\Utils::caselessRemove`
+
+`public static function caselessRemove(iterable<string> $keys, $keys, array $data): array`
+
+Remove the items given by the keys, case insensitively from the data.
+
+
+## `GuzzleHttp\Psr7\Utils::copyToStream`
+
+`public static function copyToStream(StreamInterface $source, StreamInterface $dest, int $maxLen = -1): void`
+
+Copy the contents of a stream into another stream until the given number
+of bytes have been read.
+
+
+## `GuzzleHttp\Psr7\Utils::copyToString`
+
+`public static function copyToString(StreamInterface $stream, int $maxLen = -1): string`
+
+Copy the contents of a stream into a string until the given number of
+bytes have been read.
+
+
+## `GuzzleHttp\Psr7\Utils::hash`
+
+`public static function hash(StreamInterface $stream, string $algo, bool $rawOutput = false): string`
+
+Calculate a hash of a stream.
+
+This method reads the entire stream to calculate a rolling hash, based on
+PHP's `hash_init` functions.
+
+
+## `GuzzleHttp\Psr7\Utils::modifyRequest`
+
+`public static function modifyRequest(RequestInterface $request, array $changes): RequestInterface`
+
+Clone and modify a request with the given changes.
+
+This method is useful for reducing the number of clones needed to mutate
+a message.
+
+- method: (string) Changes the HTTP method.
+- set_headers: (array) Sets the given headers.
+- remove_headers: (array) Remove the given headers.
+- body: (mixed) Sets the given body.
+- uri: (UriInterface) Set the URI.
+- query: (string) Set the query string value of the URI.
+- version: (string) Set the protocol version.
+
+
+## `GuzzleHttp\Psr7\Utils::readLine`
+
+`public static function readLine(StreamInterface $stream, int $maxLength = null): string`
+
+Read a line from the stream up to the maximum allowed buffer length.
+
+
+## `GuzzleHttp\Psr7\Utils::streamFor`
+
+`public static function streamFor(resource|string|null|int|float|bool|StreamInterface|callable|\Iterator $resource = '', array $options = []): StreamInterface`
+
+Create a new stream based on the input type.
+
+Options is an associative array that can contain the following keys:
+
+- metadata: Array of custom metadata.
+- size: Size of the stream.
+
+This method accepts the following `$resource` types:
+
+- `Psr\Http\Message\StreamInterface`: Returns the value as-is.
+- `string`: Creates a stream object that uses the given string as the contents.
+- `resource`: Creates a stream object that wraps the given PHP stream resource.
+- `Iterator`: If the provided value implements `Iterator`, then a read-only
+  stream object will be created that wraps the given iterable. Each time the
+  stream is read from, data from the iterator will fill a buffer and will be
+  continuously called until the buffer is equal to the requested read size.
+  Subsequent read calls will first read from the buffer and then call `next`
+  on the underlying iterator until it is exhausted.
+- `object` with `__toString()`: If the object has the `__toString()` method,
+  the object will be cast to a string and then a stream will be returned that
+  uses the string value.
+- `NULL`: When `null` is passed, an empty stream object is returned.
+- `callable` When a callable is passed, a read-only stream object will be
+  created that invokes the given callable. The callable is invoked with the
+  number of suggested bytes to read. The callable can return any number of
+  bytes, but MUST return `false` when there is no more data to return. The
+  stream object that wraps the callable will invoke the callable until the
+  number of requested bytes are available. Any additional bytes will be
+  buffered and used in subsequent reads.
+
+```php
+$stream = GuzzleHttp\Psr7\Utils::streamFor('foo');
+$stream = GuzzleHttp\Psr7\Utils::streamFor(fopen('/path/to/file', 'r'));
+
+$generator = function ($bytes) {
+    for ($i = 0; $i < $bytes; $i++) {
+        yield ' ';
+    }
+}
+
+$stream = GuzzleHttp\Psr7\Utils::streamFor($generator(100));
+```
+
+
+## `GuzzleHttp\Psr7\Utils::tryFopen`
+
+`public static function tryFopen(string $filename, string $mode): resource`
+
+Safely opens a PHP stream resource using a filename.
+
+When fopen fails, PHP normally raises a warning. This function adds an
+error handler that checks for errors and throws an exception instead.
+
+
+## `GuzzleHttp\Psr7\Utils::uriFor`
+
+`public static function uriFor(string|UriInterface $uri): UriInterface`
+
+Returns a UriInterface for the given value.
+
+This function accepts a string or UriInterface and returns a
+UriInterface for the given value. If the value is already a
+UriInterface, it is returned as-is.
+
+
+## `GuzzleHttp\Psr7\MimeType::fromFilename`
+
+`public static function fromFilename(string $filename): string|null`
+
+Determines the mimetype of a file by looking at its extension.
+
+
+## `GuzzleHttp\Psr7\MimeType::fromExtension`
+
+`public static function fromExtension(string $extension): string|null`
+
+Maps a file extensions to a mimetype.
+
+
+## Upgrading from Function API
+
+The static API was first introduced in 1.7.0, in order to mitigate problems with functions conflicting between global and local copies of the package. The function API will be removed in 2.0.0. A migration table has been provided here for your convenience:
+
+| Original Function | Replacement Method |
+|----------------|----------------|
+| `str` | `Message::toString` |
+| `uri_for` | `Utils::uriFor` |
+| `stream_for` | `Utils::streamFor` |
+| `parse_header` | `Header::parse` |
+| `normalize_header` | `Header::normalize` |
+| `modify_request` | `Utils::modifyRequest` |
+| `rewind_body` | `Message::rewindBody` |
+| `try_fopen` | `Utils::tryFopen` |
+| `copy_to_string` | `Utils::copyToString` |
+| `copy_to_stream` | `Utils::copyToStream` |
+| `hash` | `Utils::hash` |
+| `readline` | `Utils::readLine` |
+| `parse_request` | `Message::parseRequest` |
+| `parse_response` | `Message::parseResponse` |
+| `parse_query` | `Query::parse` |
+| `build_query` | `Query::build` |
+| `mimetype_from_filename` | `MimeType::fromFilename` |
+| `mimetype_from_extension` | `MimeType::fromExtension` |
+| `_parse_message` | `Message::parseMessage` |
+| `_parse_request_uri` | `Message::parseRequestUri` |
+| `get_message_body_summary` | `Message::bodySummary` |
+| `_caseless_remove` | `Utils::caselessRemove` |
+
+
+# Additional URI Methods
+
+Aside from the standard `Psr\Http\Message\UriInterface` implementation in form of the `GuzzleHttp\Psr7\Uri` class,
+this library also provides additional functionality when working with URIs as static methods.
+
+## URI Types
+
+An instance of `Psr\Http\Message\UriInterface` can either be an absolute URI or a relative reference.
+An absolute URI has a scheme. A relative reference is used to express a URI relative to another URI,
+the base URI. Relative references can be divided into several forms according to
+[RFC 3986 Section 4.2](https://tools.ietf.org/html/rfc3986#section-4.2):
+
+- network-path references, e.g. `//example.com/path`
+- absolute-path references, e.g. `/path`
+- relative-path references, e.g. `subpath`
+
+The following methods can be used to identify the type of the URI.
+
+### `GuzzleHttp\Psr7\Uri::isAbsolute`
+
+`public static function isAbsolute(UriInterface $uri): bool`
+
+Whether the URI is absolute, i.e. it has a scheme.
+
+### `GuzzleHttp\Psr7\Uri::isNetworkPathReference`
+
+`public static function isNetworkPathReference(UriInterface $uri): bool`
+
+Whether the URI is a network-path reference. A relative reference that begins with two slash characters is
+termed an network-path reference.
+
+### `GuzzleHttp\Psr7\Uri::isAbsolutePathReference`
+
+`public static function isAbsolutePathReference(UriInterface $uri): bool`
+
+Whether the URI is a absolute-path reference. A relative reference that begins with a single slash character is
+termed an absolute-path reference.
+
+### `GuzzleHttp\Psr7\Uri::isRelativePathReference`
+
+`public static function isRelativePathReference(UriInterface $uri): bool`
+
+Whether the URI is a relative-path reference. A relative reference that does not begin with a slash character is
+termed a relative-path reference.
+
+### `GuzzleHttp\Psr7\Uri::isSameDocumentReference`
+
+`public static function isSameDocumentReference(UriInterface $uri, UriInterface $base = null): bool`
+
+Whether the URI is a same-document reference. A same-document reference refers to a URI that is, aside from its
+fragment component, identical to the base URI. When no base URI is given, only an empty URI reference
+(apart from its fragment) is considered a same-document reference.
+
+## URI Components
+
+Additional methods to work with URI components.
+
+### `GuzzleHttp\Psr7\Uri::isDefaultPort`
+
+`public static function isDefaultPort(UriInterface $uri): bool`
+
+Whether the URI has the default port of the current scheme. `Psr\Http\Message\UriInterface::getPort` may return null
+or the standard port. This method can be used independently of the implementation.
+
+### `GuzzleHttp\Psr7\Uri::composeComponents`
+
+`public static function composeComponents($scheme, $authority, $path, $query, $fragment): string`
+
+Composes a URI reference string from its various components according to
+[RFC 3986 Section 5.3](https://tools.ietf.org/html/rfc3986#section-5.3). Usually this method does not need to be called
+manually but instead is used indirectly via `Psr\Http\Message\UriInterface::__toString`.
+
+### `GuzzleHttp\Psr7\Uri::fromParts`
+
+`public static function fromParts(array $parts): UriInterface`
+
+Creates a URI from a hash of [`parse_url`](http://php.net/manual/en/function.parse-url.php) components.
+
+
+### `GuzzleHttp\Psr7\Uri::withQueryValue`
+
+`public static function withQueryValue(UriInterface $uri, $key, $value): UriInterface`
+
+Creates a new URI with a specific query string value. Any existing query string values that exactly match the
+provided key are removed and replaced with the given key value pair. A value of null will set the query string
+key without a value, e.g. "key" instead of "key=value".
+
+### `GuzzleHttp\Psr7\Uri::withQueryValues`
+
+`public static function withQueryValues(UriInterface $uri, array $keyValueArray): UriInterface`
+
+Creates a new URI with multiple query string values. It has the same behavior as `withQueryValue()` but for an
+associative array of key => value.
+
+### `GuzzleHttp\Psr7\Uri::withoutQueryValue`
+
+`public static function withoutQueryValue(UriInterface $uri, $key): UriInterface`
+
+Creates a new URI with a specific query string value removed. Any existing query string values that exactly match the
+provided key are removed.
+
+## Reference Resolution
+
+`GuzzleHttp\Psr7\UriResolver` provides methods to resolve a URI reference in the context of a base URI according
+to [RFC 3986 Section 5](https://tools.ietf.org/html/rfc3986#section-5). This is for example also what web browsers
+do when resolving a link in a website based on the current request URI.
+
+### `GuzzleHttp\Psr7\UriResolver::resolve`
+
+`public static function resolve(UriInterface $base, UriInterface $rel): UriInterface`
+
+Converts the relative URI into a new URI that is resolved against the base URI.
+
+### `GuzzleHttp\Psr7\UriResolver::removeDotSegments`
+
+`public static function removeDotSegments(string $path): string`
+
+Removes dot segments from a path and returns the new path according to
+[RFC 3986 Section 5.2.4](https://tools.ietf.org/html/rfc3986#section-5.2.4).
+
+### `GuzzleHttp\Psr7\UriResolver::relativize`
+
+`public static function relativize(UriInterface $base, UriInterface $target): UriInterface`
+
+Returns the target URI as a relative reference from the base URI. This method is the counterpart to resolve():
+
+```php
+(string) $target === (string) UriResolver::resolve($base, UriResolver::relativize($base, $target))
+```
+
+One use-case is to use the current request URI as base URI and then generate relative links in your documents
+to reduce the document size or offer self-contained downloadable document archives.
+
+```php
+$base = new Uri('http://example.com/a/b/');
+echo UriResolver::relativize($base, new Uri('http://example.com/a/b/c'));  // prints 'c'.
+echo UriResolver::relativize($base, new Uri('http://example.com/a/x/y'));  // prints '../x/y'.
+echo UriResolver::relativize($base, new Uri('http://example.com/a/b/?q')); // prints '?q'.
+echo UriResolver::relativize($base, new Uri('http://example.org/a/b/'));   // prints '//example.org/a/b/'.
+```
+
+## Normalization and Comparison
+
+`GuzzleHttp\Psr7\UriNormalizer` provides methods to normalize and compare URIs according to
+[RFC 3986 Section 6](https://tools.ietf.org/html/rfc3986#section-6).
+
+### `GuzzleHttp\Psr7\UriNormalizer::normalize`
+
+`public static function normalize(UriInterface $uri, $flags = self::PRESERVING_NORMALIZATIONS): UriInterface`
+
+Returns a normalized URI. The scheme and host component are already normalized to lowercase per PSR-7 UriInterface.
+This methods adds additional normalizations that can be configured with the `$flags` parameter which is a bitmask
+of normalizations to apply. The following normalizations are available:
+
+- `UriNormalizer::PRESERVING_NORMALIZATIONS`
+
+    Default normalizations which only include the ones that preserve semantics.
+
+- `UriNormalizer::CAPITALIZE_PERCENT_ENCODING`
+
+    All letters within a percent-encoding triplet (e.g., "%3A") are case-insensitive, and should be capitalized.
+
+    Example: `http://example.org/a%c2%b1b` → `http://example.org/a%C2%B1b`
+
+- `UriNormalizer::DECODE_UNRESERVED_CHARACTERS`
+
+    Decodes percent-encoded octets of unreserved characters. For consistency, percent-encoded octets in the ranges of
+    ALPHA (%41–%5A and %61–%7A), DIGIT (%30–%39), hyphen (%2D), period (%2E), underscore (%5F), or tilde (%7E) should
+    not be created by URI producers and, when found in a URI, should be decoded to their corresponding unreserved
+    characters by URI normalizers.
+
+    Example: `http://example.org/%7Eusern%61me/` → `http://example.org/~username/`
+
+- `UriNormalizer::CONVERT_EMPTY_PATH`
+
+    Converts the empty path to "/" for http and https URIs.
+
+    Example: `http://example.org` → `http://example.org/`
+
+- `UriNormalizer::REMOVE_DEFAULT_HOST`
+
+    Removes the default host of the given URI scheme from the URI. Only the "file" scheme defines the default host
+    "localhost". All of `file:/myfile`, `file:///myfile`, and `file://localhost/myfile` are equivalent according to
+    RFC 3986.
+
+    Example: `file://localhost/myfile` → `file:///myfile`
+
+- `UriNormalizer::REMOVE_DEFAULT_PORT`
+
+    Removes the default port of the given URI scheme from the URI.
+
+    Example: `http://example.org:80/` → `http://example.org/`
+
+- `UriNormalizer::REMOVE_DOT_SEGMENTS`
+
+    Removes unnecessary dot-segments. Dot-segments in relative-path references are not removed as it would
+    change the semantics of the URI reference.
+
+    Example: `http://example.org/../a/b/../c/./d.html` → `http://example.org/a/c/d.html`
+
+- `UriNormalizer::REMOVE_DUPLICATE_SLASHES`
+
+    Paths which include two or more adjacent slashes are converted to one. Webservers usually ignore duplicate slashes
+    and treat those URIs equivalent. But in theory those URIs do not need to be equivalent. So this normalization
+    may change the semantics. Encoded slashes (%2F) are not removed.
+
+    Example: `http://example.org//foo///bar.html` → `http://example.org/foo/bar.html`
+
+- `UriNormalizer::SORT_QUERY_PARAMETERS`
+
+    Sort query parameters with their values in alphabetical order. However, the order of parameters in a URI may be
+    significant (this is not defined by the standard). So this normalization is not safe and may change the semantics
+    of the URI.
+
+    Example: `?lang=en&article=fred` → `?article=fred&lang=en`
+
+### `GuzzleHttp\Psr7\UriNormalizer::isEquivalent`
+
+`public static function isEquivalent(UriInterface $uri1, UriInterface $uri2, $normalizations = self::PRESERVING_NORMALIZATIONS): bool`
+
+Whether two URIs can be considered equivalent. Both URIs are normalized automatically before comparison with the given
+`$normalizations` bitmask. The method also accepts relative URI references and returns true when they are equivalent.
+This of course assumes they will be resolved against the same base URI. If this is not the case, determination of
+equivalence or difference of relative references does not mean anything.
--- a/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/composer.json
+++ b/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/composer.json
@@ -0,0 +1,49 @@
+{
+    "name": "guzzlehttp/psr7",
+    "type": "library",
+    "description": "PSR-7 message implementation that also provides common utility methods",
+    "keywords": ["request", "response", "message", "stream", "http", "uri", "url", "psr-7"],
+    "license": "MIT",
+    "authors": [
+        {
+            "name": "Michael Dowling",
+            "email": "mtdowling@gmail.com",
+            "homepage": "https://github.com/mtdowling"
+        },
+        {
+            "name": "Tobias Schultze",
+            "homepage": "https://github.com/Tobion"
+        }
+    ],
+    "require": {
+        "php": ">=5.4.0",
+        "psr/http-message": "~1.0",
+        "ralouphie/getallheaders": "^2.0.5 || ^3.0.0"
+    },
+    "require-dev": {
+        "phpunit/phpunit": "~4.8.36 || ^5.7.27 || ^6.5.14 || ^7.5.20 || ^8.5.8 || ^9.3.10",
+        "ext-zlib": "*"
+    },
+    "provide": {
+        "psr/http-message-implementation": "1.0"
+    },
+    "suggest": {
+        "laminas/laminas-httphandlerrunner": "Emit PSR-7 responses"
+    },
+    "autoload": {
+        "psr-4": {
+            "GuzzleHttp\\Psr7\\": "src/"
+        },
+        "files": ["src/functions_include.php"]
+    },
+    "autoload-dev": {
+        "psr-4": {
+            "GuzzleHttp\\Tests\\Psr7\\": "tests/"
+        }
+    },
+    "extra": {
+        "branch-alias": {
+            "dev-master": "1.7-dev"
+        }
+    }
+}
--- a/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/AppendStream.php
+++ b/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/AppendStream.php
@@ -0,0 +1,244 @@
+<?php
+
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * Reads from multiple streams, one after the other.
+ *
+ * This is a read-only stream decorator.
+ */
+class AppendStream implements StreamInterface
+{
+    /** @var StreamInterface[] Streams being decorated */
+    private $streams = [];
+
+    private $seekable = true;
+    private $current = 0;
+    private $pos = 0;
+
+    /**
+     * @param StreamInterface[] $streams Streams to decorate. Each stream must
+     *                                   be readable.
+     */
+    public function __construct(array $streams = [])
+    {
+        foreach ($streams as $stream) {
+            $this->addStream($stream);
+        }
+    }
+
+    public function __toString()
+    {
+        try {
+            $this->rewind();
+            return $this->getContents();
+        } catch (\Exception $e) {
+            return '';
+        }
+    }
+
+    /**
+     * Add a stream to the AppendStream
+     *
+     * @param StreamInterface $stream Stream to append. Must be readable.
+     *
+     * @throws \InvalidArgumentException if the stream is not readable
+     */
+    public function addStream(StreamInterface $stream)
+    {
+        if (!$stream->isReadable()) {
+            throw new \InvalidArgumentException('Each stream must be readable');
+        }
+
+        // The stream is only seekable if all streams are seekable
+        if (!$stream->isSeekable()) {
+            $this->seekable = false;
+        }
+
+        $this->streams[] = $stream;
+    }
+
+    public function getContents()
+    {
+        return Utils::copyToString($this);
+    }
+
+    /**
+     * Closes each attached stream.
+     *
+     * {@inheritdoc}
+     */
+    public function close()
+    {
+        $this->pos = $this->current = 0;
+        $this->seekable = true;
+
+        foreach ($this->streams as $stream) {
+            $stream->close();
+        }
+
+        $this->streams = [];
+    }
+
+    /**
+     * Detaches each attached stream.
+     *
+     * Returns null as it's not clear which underlying stream resource to return.
+     *
+     * {@inheritdoc}
+     */
+    public function detach()
+    {
+        $this->pos = $this->current = 0;
+        $this->seekable = true;
+
+        foreach ($this->streams as $stream) {
+            $stream->detach();
+        }
+
+        $this->streams = [];
+
+        return null;
+    }
+
+    public function tell()
+    {
+        return $this->pos;
+    }
+
+    /**
+     * Tries to calculate the size by adding the size of each stream.
+     *
+     * If any of the streams do not return a valid number, then the size of the
+     * append stream cannot be determined and null is returned.
+     *
+     * {@inheritdoc}
+     */
+    public function getSize()
+    {
+        $size = 0;
+
+        foreach ($this->streams as $stream) {
+            $s = $stream->getSize();
+            if ($s === null) {
+                return null;
+            }
+            $size += $s;
+        }
+
+        return $size;
+    }
+
+    public function eof()
+    {
+        return !$this->streams ||
+            ($this->current >= count($this->streams) - 1 &&
+             $this->streams[$this->current]->eof());
+    }
+
+    public function rewind()
+    {
+        $this->seek(0);
+    }
+
+    /**
+     * Attempts to seek to the given position. Only supports SEEK_SET.
+     *
+     * {@inheritdoc}
+     */
+    public function seek($offset, $whence = SEEK_SET)
+    {
+        if (!$this->seekable) {
+            throw new \RuntimeException('This AppendStream is not seekable');
+        } elseif ($whence !== SEEK_SET) {
+            throw new \RuntimeException('The AppendStream can only seek with SEEK_SET');
+        }
+
+        $this->pos = $this->current = 0;
+
+        // Rewind each stream
+        foreach ($this->streams as $i => $stream) {
+            try {
+                $stream->rewind();
+            } catch (\Exception $e) {
+                throw new \RuntimeException('Unable to seek stream '
+                    . $i . ' of the AppendStream', 0, $e);
+            }
+        }
+
+        // Seek to the actual position by reading from each stream
+        while ($this->pos < $offset && !$this->eof()) {
+            $result = $this->read(min(8096, $offset - $this->pos));
+            if ($result === '') {
+                break;
+            }
+        }
+    }
+
+    /**
+     * Reads from all of the appended streams until the length is met or EOF.
+     *
+     * {@inheritdoc}
+     */
+    public function read($length)
+    {
+        $buffer = '';
+        $total = count($this->streams) - 1;
+        $remaining = $length;
+        $progressToNext = false;
+
+        while ($remaining > 0) {
+
+            // Progress to the next stream if needed.
+            if ($progressToNext || $this->streams[$this->current]->eof()) {
+                $progressToNext = false;
+                if ($this->current === $total) {
+                    break;
+                }
+                $this->current++;
+            }
+
+            $result = $this->streams[$this->current]->read($remaining);
+
+            // Using a loose comparison here to match on '', false, and null
+            if ($result == null) {
+                $progressToNext = true;
+                continue;
+            }
+
+            $buffer .= $result;
+            $remaining = $length - strlen($buffer);
+        }
+
+        $this->pos += strlen($buffer);
+
+        return $buffer;
+    }
+
+    public function isReadable()
+    {
+        return true;
+    }
+
+    public function isWritable()
+    {
+        return false;
+    }
+
+    public function isSeekable()
+    {
+        return $this->seekable;
+    }
+
+    public function write($string)
+    {
+        throw new \RuntimeException('Cannot write to an AppendStream');
+    }
+
+    public function getMetadata($key = null)
+    {
+        return $key ? null : [];
+    }
+}
--- a/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/BufferStream.php
+++ b/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/BufferStream.php
@@ -0,0 +1,140 @@
+<?php
+
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * Provides a buffer stream that can be written to to fill a buffer, and read
+ * from to remove bytes from the buffer.
+ *
+ * This stream returns a "hwm" metadata value that tells upstream consumers
+ * what the configured high water mark of the stream is, or the maximum
+ * preferred size of the buffer.
+ */
+class BufferStream implements StreamInterface
+{
+    private $hwm;
+    private $buffer = '';
+
+    /**
+     * @param int $hwm High water mark, representing the preferred maximum
+     *                 buffer size. If the size of the buffer exceeds the high
+     *                 water mark, then calls to write will continue to succeed
+     *                 but will return false to inform writers to slow down
+     *                 until the buffer has been drained by reading from it.
+     */
+    public function __construct($hwm = 16384)
+    {
+        $this->hwm = $hwm;
+    }
+
+    public function __toString()
+    {
+        return $this->getContents();
+    }
+
+    public function getContents()
+    {
+        $buffer = $this->buffer;
+        $this->buffer = '';
+
+        return $buffer;
+    }
+
+    public function close()
+    {
+        $this->buffer = '';
+    }
+
+    public function detach()
+    {
+        $this->close();
+
+        return null;
+    }
+
+    public function getSize()
+    {
+        return strlen($this->buffer);
+    }
+
+    public function isReadable()
+    {
+        return true;
+    }
+
+    public function isWritable()
+    {
+        return true;
+    }
+
+    public function isSeekable()
+    {
+        return false;
+    }
+
+    public function rewind()
+    {
+        $this->seek(0);
+    }
+
+    public function seek($offset, $whence = SEEK_SET)
+    {
+        throw new \RuntimeException('Cannot seek a BufferStream');
+    }
+
+    public function eof()
+    {
+        return strlen($this->buffer) === 0;
+    }
+
+    public function tell()
+    {
+        throw new \RuntimeException('Cannot determine the position of a BufferStream');
+    }
+
+    /**
+     * Reads data from the buffer.
+     */
+    public function read($length)
+    {
+        $currentLength = strlen($this->buffer);
+
+        if ($length >= $currentLength) {
+            // No need to slice the buffer because we don't have enough data.
+            $result = $this->buffer;
+            $this->buffer = '';
+        } else {
+            // Slice up the result to provide a subset of the buffer.
+            $result = substr($this->buffer, 0, $length);
+            $this->buffer = substr($this->buffer, $length);
+        }
+
+        return $result;
+    }
+
+    /**
+     * Writes data to the buffer.
+     */
+    public function write($string)
+    {
+        $this->buffer .= $string;
+
+        // TODO: What should happen here?
+        if (strlen($this->buffer) >= $this->hwm) {
+            return false;
+        }
+
+        return strlen($string);
+    }
+
+    public function getMetadata($key = null)
+    {
+        if ($key == 'hwm') {
+            return $this->hwm;
+        }
+
+        return $key ? null : [];
+    }
+}
--- a/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/CachingStream.php
+++ b/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/CachingStream.php
@@ -0,0 +1,139 @@
+<?php
+
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * Stream decorator that can cache previously read bytes from a sequentially
+ * read stream.
+ */
+class CachingStream implements StreamInterface
+{
+    use StreamDecoratorTrait;
+
+    /** @var StreamInterface Stream being wrapped */
+    private $remoteStream;
+
+    /** @var int Number of bytes to skip reading due to a write on the buffer */
+    private $skipReadBytes = 0;
+
+    /**
+     * We will treat the buffer object as the body of the stream
+     *
+     * @param StreamInterface $stream Stream to cache
+     * @param StreamInterface $target Optionally specify where data is cached
+     */
+    public function __construct(
+        StreamInterface $stream,
+        StreamInterface $target = null
+    ) {
+        $this->remoteStream = $stream;
+        $this->stream = $target ?: new Stream(fopen('php://temp', 'r+'));
+    }
+
+    public function getSize()
+    {
+        return max($this->stream->getSize(), $this->remoteStream->getSize());
+    }
+
+    public function rewind()
+    {
+        $this->seek(0);
+    }
+
+    public function seek($offset, $whence = SEEK_SET)
+    {
+        if ($whence == SEEK_SET) {
+            $byte = $offset;
+        } elseif ($whence == SEEK_CUR) {
+            $byte = $offset + $this->tell();
+        } elseif ($whence == SEEK_END) {
+            $size = $this->remoteStream->getSize();
+            if ($size === null) {
+                $size = $this->cacheEntireStream();
+            }
+            $byte = $size + $offset;
+        } else {
+            throw new \InvalidArgumentException('Invalid whence');
+        }
+
+        $diff = $byte - $this->stream->getSize();
+
+        if ($diff > 0) {
+            // Read the remoteStream until we have read in at least the amount
+            // of bytes requested, or we reach the end of the file.
+            while ($diff > 0 && !$this->remoteStream->eof()) {
+                $this->read($diff);
+                $diff = $byte - $this->stream->getSize();
+            }
+        } else {
+            // We can just do a normal seek since we've already seen this byte.
+            $this->stream->seek($byte);
+        }
+    }
+
+    public function read($length)
+    {
+        // Perform a regular read on any previously read data from the buffer
+        $data = $this->stream->read($length);
+        $remaining = $length - strlen($data);
+
+        // More data was requested so read from the remote stream
+        if ($remaining) {
+            // If data was written to the buffer in a position that would have
+            // been filled from the remote stream, then we must skip bytes on
+            // the remote stream to emulate overwriting bytes from that
+            // position. This mimics the behavior of other PHP stream wrappers.
+            $remoteData = $this->remoteStream->read(
+                $remaining + $this->skipReadBytes
+            );
+
+            if ($this->skipReadBytes) {
+                $len = strlen($remoteData);
+                $remoteData = substr($remoteData, $this->skipReadBytes);
+                $this->skipReadBytes = max(0, $this->skipReadBytes - $len);
+            }
+
+            $data .= $remoteData;
+            $this->stream->write($remoteData);
+        }
+
+        return $data;
+    }
+
+    public function write($string)
+    {
+        // When appending to the end of the currently read stream, you'll want
+        // to skip bytes from being read from the remote stream to emulate
+        // other stream wrappers. Basically replacing bytes of data of a fixed
+        // length.
+        $overflow = (strlen($string) + $this->tell()) - $this->remoteStream->tell();
+        if ($overflow > 0) {
+            $this->skipReadBytes += $overflow;
+        }
+
+        return $this->stream->write($string);
+    }
+
+    public function eof()
+    {
+        return $this->stream->eof() && $this->remoteStream->eof();
+    }
+
+    /**
+     * Close both the remote stream and buffer stream
+     */
+    public function close()
+    {
+        $this->remoteStream->close() && $this->stream->close();
+    }
+
+    private function cacheEntireStream()
+    {
+        $target = new FnStream(['write' => 'strlen']);
+        Utils::copyToStream($this, $target);
+
+        return $this->tell();
+    }
+}
--- a/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/DroppingStream.php
+++ b/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/DroppingStream.php
@@ -0,0 +1,43 @@
+<?php
+
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * Stream decorator that begins dropping data once the size of the underlying
+ * stream becomes too full.
+ */
+class DroppingStream implements StreamInterface
+{
+    use StreamDecoratorTrait;
+
+    private $maxLength;
+
+    /**
+     * @param StreamInterface $stream    Underlying stream to decorate.
+     * @param int             $maxLength Maximum size before dropping data.
+     */
+    public function __construct(StreamInterface $stream, $maxLength)
+    {
+        $this->stream = $stream;
+        $this->maxLength = $maxLength;
+    }
+
+    public function write($string)
+    {
+        $diff = $this->maxLength - $this->stream->getSize();
+
+        // Begin returning 0 when the underlying stream is too large.
+        if ($diff <= 0) {
+            return 0;
+        }
+
+        // Write the stream or a subset of the stream if needed.
+        if (strlen($string) < $diff) {
+            return $this->stream->write($string);
+        }
+
+        return $this->stream->write(substr($string, 0, $diff));
+    }
+}
--- a/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/FnStream.php
+++ b/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/FnStream.php
@@ -0,0 +1,160 @@
+<?php
+
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * Compose stream implementations based on a hash of functions.
+ *
+ * Allows for easy testing and extension of a provided stream without needing
+ * to create a concrete class for a simple extension point.
+ */
+class FnStream implements StreamInterface
+{
+    /** @var array */
+    private $methods;
+
+    /** @var array Methods that must be implemented in the given array */
+    private static $slots = ['__toString', 'close', 'detach', 'rewind',
+        'getSize', 'tell', 'eof', 'isSeekable', 'seek', 'isWritable', 'write',
+        'isReadable', 'read', 'getContents', 'getMetadata'];
+
+    /**
+     * @param array $methods Hash of method name to a callable.
+     */
+    public function __construct(array $methods)
+    {
+        $this->methods = $methods;
+
+        // Create the functions on the class
+        foreach ($methods as $name => $fn) {
+            $this->{'_fn_' . $name} = $fn;
+        }
+    }
+
+    /**
+     * Lazily determine which methods are not implemented.
+     *
+     * @throws \BadMethodCallException
+     */
+    public function __get($name)
+    {
+        throw new \BadMethodCallException(str_replace('_fn_', '', $name)
+            . '() is not implemented in the FnStream');
+    }
+
+    /**
+     * The close method is called on the underlying stream only if possible.
+     */
+    public function __destruct()
+    {
+        if (isset($this->_fn_close)) {
+            call_user_func($this->_fn_close);
+        }
+    }
+
+    /**
+     * An unserialize would allow the __destruct to run when the unserialized value goes out of scope.
+     * @throws \LogicException
+     */
+    public function __wakeup()
+    {
+        throw new \LogicException('FnStream should never be unserialized');
+    }
+
+    /**
+     * Adds custom functionality to an underlying stream by intercepting
+     * specific method calls.
+     *
+     * @param StreamInterface $stream  Stream to decorate
+     * @param array           $methods Hash of method name to a closure
+     *
+     * @return FnStream
+     */
+    public static function decorate(StreamInterface $stream, array $methods)
+    {
+        // If any of the required methods were not provided, then simply
+        // proxy to the decorated stream.
+        foreach (array_diff(self::$slots, array_keys($methods)) as $diff) {
+            $methods[$diff] = [$stream, $diff];
+        }
+
+        return new self($methods);
+    }
+
+    public function __toString()
+    {
+        return call_user_func($this->_fn___toString);
+    }
+
+    public function close()
+    {
+        return call_user_func($this->_fn_close);
+    }
+
+    public function detach()
+    {
+        return call_user_func($this->_fn_detach);
+    }
+
+    public function getSize()
+    {
+        return call_user_func($this->_fn_getSize);
+    }
+
+    public function tell()
+    {
+        return call_user_func($this->_fn_tell);
+    }
+
+    public function eof()
+    {
+        return call_user_func($this->_fn_eof);
+    }
+
+    public function isSeekable()
+    {
+        return call_user_func($this->_fn_isSeekable);
+    }
+
+    public function rewind()
+    {
+        call_user_func($this->_fn_rewind);
+    }
+
+    public function seek($offset, $whence = SEEK_SET)
+    {
+        call_user_func($this->_fn_seek, $offset, $whence);
+    }
+
+    public function isWritable()
+    {
+        return call_user_func($this->_fn_isWritable);
+    }
+
+    public function write($string)
+    {
+        return call_user_func($this->_fn_write, $string);
+    }
+
+    public function isReadable()
+    {
+        return call_user_func($this->_fn_isReadable);
+    }
+
+    public function read($length)
+    {
+        return call_user_func($this->_fn_read, $length);
+    }
+
+    public function getContents()
+    {
+        return call_user_func($this->_fn_getContents);
+    }
+
+    public function getMetadata($key = null)
+    {
+        return call_user_func($this->_fn_getMetadata, $key);
+    }
+}
--- a/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/Header.php
+++ b/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/Header.php
@@ -0,0 +1,71 @@
+<?php
+
+namespace GuzzleHttp\Psr7;
+
+final class Header
+{
+    /**
+     * Parse an array of header values containing ";" separated data into an
+     * array of associative arrays representing the header key value pair data
+     * of the header. When a parameter does not contain a value, but just
+     * contains a key, this function will inject a key with a '' string value.
+     *
+     * @param string|array $header Header to parse into components.
+     *
+     * @return array Returns the parsed header values.
+     */
+    public static function parse($header)
+    {
+        static $trimmed = "\"'  \n\t\r";
+        $params = $matches = [];
+
+        foreach (self::normalize($header) as $val) {
+            $part = [];
+            foreach (preg_split('/;(?=([^"]*"[^"]*")*[^"]*$)/', $val) as $kvp) {
+                if (preg_match_all('/<[^>]+>|[^=]+/', $kvp, $matches)) {
+                    $m = $matches[0];
+                    if (isset($m[1])) {
+                        $part[trim($m[0], $trimmed)] = trim($m[1], $trimmed);
+                    } else {
+                        $part[] = trim($m[0], $trimmed);
+                    }
+                }
+            }
+            if ($part) {
+                $params[] = $part;
+            }
+        }
+
+        return $params;
+    }
+
+    /**
+     * Converts an array of header values that may contain comma separated
+     * headers into an array of headers with no comma separated values.
+     *
+     * @param string|array $header Header to normalize.
+     *
+     * @return array Returns the normalized header field values.
+     */
+    public static function normalize($header)
+    {
+        if (!is_array($header)) {
+            return array_map('trim', explode(',', $header));
+        }
+
+        $result = [];
+        foreach ($header as $value) {
+            foreach ((array) $value as $v) {
+                if (strpos($v, ',') === false) {
+                    $result[] = $v;
+                    continue;
+                }
+                foreach (preg_split('/,(?=([^"]*"[^"]*")*[^"]*$)/', $v) as $vv) {
+                    $result[] = trim($vv);
+                }
+            }
+        }
+
+        return $result;
+    }
+}
--- a/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/InflateStream.php
+++ b/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/InflateStream.php
@@ -0,0 +1,53 @@
+<?php
+
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * Uses PHP's zlib.inflate filter to inflate deflate or gzipped content.
+ *
+ * This stream decorator skips the first 10 bytes of the given stream to remove
+ * the gzip header, converts the provided stream to a PHP stream resource,
+ * then appends the zlib.inflate filter. The stream is then converted back
+ * to a Guzzle stream resource to be used as a Guzzle stream.
+ *
+ * @link http://tools.ietf.org/html/rfc1952
+ * @link http://php.net/manual/en/filters.compression.php
+ */
+class InflateStream implements StreamInterface
+{
+    use StreamDecoratorTrait;
+
+    public function __construct(StreamInterface $stream)
+    {
+        // read the first 10 bytes, ie. gzip header
+        $header = $stream->read(10);
+        $filenameHeaderLength = $this->getLengthOfPossibleFilenameHeader($stream, $header);
+        // Skip the header, that is 10 + length of filename + 1 (nil) bytes
+        $stream = new LimitStream($stream, -1, 10 + $filenameHeaderLength);
+        $resource = StreamWrapper::getResource($stream);
+        stream_filter_append($resource, 'zlib.inflate', STREAM_FILTER_READ);
+        $this->stream = $stream->isSeekable() ? new Stream($resource) : new NoSeekStream(new Stream($resource));
+    }
+
+    /**
+     * @param StreamInterface $stream
+     * @param $header
+     * @return int
+     */
+    private function getLengthOfPossibleFilenameHeader(StreamInterface $stream, $header)
+    {
+        $filename_header_length = 0;
+
+        if (substr(bin2hex($header), 6, 2) === '08') {
+            // we have a filename, read until nil
+            $filename_header_length = 1;
+            while ($stream->read(1) !== chr(0)) {
+                $filename_header_length++;
+            }
+        }
+
+        return $filename_header_length;
+    }
+}
--- a/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/LazyOpenStream.php
+++ b/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/LazyOpenStream.php
@@ -0,0 +1,40 @@
+<?php
+
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * Lazily reads or writes to a file that is opened only after an IO operation
+ * take place on the stream.
+ */
+class LazyOpenStream implements StreamInterface
+{
+    use StreamDecoratorTrait;
+
+    /** @var string File to open */
+    private $filename;
+
+    /** @var string $mode */
+    private $mode;
+
+    /**
+     * @param string $filename File to lazily open
+     * @param string $mode     fopen mode to use when opening the stream
+     */
+    public function __construct($filename, $mode)
+    {
+        $this->filename = $filename;
+        $this->mode = $mode;
+    }
+
+    /**
+     * Creates the underlying stream lazily when required.
+     *
+     * @return StreamInterface
+     */
+    protected function createStream()
+    {
+        return Utils::streamFor(Utils::tryFopen($this->filename, $this->mode));
+    }
+}
--- a/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/LimitStream.php
+++ b/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/LimitStream.php
@@ -0,0 +1,156 @@
+<?php
+
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\StreamInterface;
+
+
+/**
+ * Decorator used to return only a subset of a stream
+ */
+class LimitStream implements StreamInterface
+{
+    use StreamDecoratorTrait;
+
+    /** @var int Offset to start reading from */
+    private $offset;
+
+    /** @var int Limit the number of bytes that can be read */
+    private $limit;
+
+    /**
+     * @param StreamInterface $stream Stream to wrap
+     * @param int             $limit  Total number of bytes to allow to be read
+     *                                from the stream. Pass -1 for no limit.
+     * @param int             $offset Position to seek to before reading (only
+     *                                works on seekable streams).
+     */
+    public function __construct(
+        StreamInterface $stream,
+        $limit = -1,
+        $offset = 0
+    ) {
+        $this->stream = $stream;
+        $this->setLimit($limit);
+        $this->setOffset($offset);
+    }
+
+    public function eof()
+    {
+        // Always return true if the underlying stream is EOF
+        if ($this->stream->eof()) {
+            return true;
+        }
+
+        // No limit and the underlying stream is not at EOF
+        if ($this->limit == -1) {
+            return false;
+        }
+
+        return $this->stream->tell() >= $this->offset + $this->limit;
+    }
+
+    /**
+     * Returns the size of the limited subset of data
+     * {@inheritdoc}
+     */
+    public function getSize()
+    {
+        if (null === ($length = $this->stream->getSize())) {
+            return null;
+        } elseif ($this->limit == -1) {
+            return $length - $this->offset;
+        } else {
+            return min($this->limit, $length - $this->offset);
+        }
+    }
+
+    /**
+     * Allow for a bounded seek on the read limited stream
+     * {@inheritdoc}
+     */
+    public function seek($offset, $whence = SEEK_SET)
+    {
+        if ($whence !== SEEK_SET || $offset < 0) {
+            throw new \RuntimeException(sprintf(
+                'Cannot seek to offset %s with whence %s',
+                $offset,
+                $whence
+            ));
+        }
+
+        $offset += $this->offset;
+
+        if ($this->limit !== -1) {
+            if ($offset > $this->offset + $this->limit) {
+                $offset = $this->offset + $this->limit;
+            }
+        }
+
+        $this->stream->seek($offset);
+    }
+
+    /**
+     * Give a relative tell()
+     * {@inheritdoc}
+     */
+    public function tell()
+    {
+        return $this->stream->tell() - $this->offset;
+    }
+
+    /**
+     * Set the offset to start limiting from
+     *
+     * @param int $offset Offset to seek to and begin byte limiting from
+     *
+     * @throws \RuntimeException if the stream cannot be seeked.
+     */
+    public function setOffset($offset)
+    {
+        $current = $this->stream->tell();
+
+        if ($current !== $offset) {
+            // If the stream cannot seek to the offset position, then read to it
+            if ($this->stream->isSeekable()) {
+                $this->stream->seek($offset);
+            } elseif ($current > $offset) {
+                throw new \RuntimeException("Could not seek to stream offset $offset");
+            } else {
+                $this->stream->read($offset - $current);
+            }
+        }
+
+        $this->offset = $offset;
+    }
+
+    /**
+     * Set the limit of bytes that the decorator allows to be read from the
+     * stream.
+     *
+     * @param int $limit Number of bytes to allow to be read from the stream.
+     *                   Use -1 for no limit.
+     */
+    public function setLimit($limit)
+    {
+        $this->limit = $limit;
+    }
+
+    public function read($length)
+    {
+        if ($this->limit == -1) {
+            return $this->stream->read($length);
+        }
+
+        // Check if the current position is less than the total allowed
+        // bytes + original offset
+        $remaining = ($this->offset + $this->limit) - $this->stream->tell();
+        if ($remaining > 0) {
+            // Only return the amount of requested data, ensuring that the byte
+            // limit is not exceeded
+            return $this->stream->read(min($remaining, $length));
+        }
+
+        return '';
+    }
+}
--- a/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/Message.php
+++ b/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/Message.php
@@ -0,0 +1,252 @@
+<?php
+
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\MessageInterface;
+use Psr\Http\Message\RequestInterface;
+use Psr\Http\Message\ResponseInterface;
+
+final class Message
+{
+    /**
+     * Returns the string representation of an HTTP message.
+     *
+     * @param MessageInterface $message Message to convert to a string.
+     *
+     * @return string
+     */
+    public static function toString(MessageInterface $message)
+    {
+        if ($message instanceof RequestInterface) {
+            $msg = trim($message->getMethod() . ' '
+                    . $message->getRequestTarget())
+                . ' HTTP/' . $message->getProtocolVersion();
+            if (!$message->hasHeader('host')) {
+                $msg .= "\r\nHost: " . $message->getUri()->getHost();
+            }
+        } elseif ($message instanceof ResponseInterface) {
+            $msg = 'HTTP/' . $message->getProtocolVersion() . ' '
+                . $message->getStatusCode() . ' '
+                . $message->getReasonPhrase();
+        } else {
+            throw new \InvalidArgumentException('Unknown message type');
+        }
+
+        foreach ($message->getHeaders() as $name => $values) {
+            if (strtolower($name) === 'set-cookie') {
+                foreach ($values as $value) {
+                    $msg .= "\r\n{$name}: " . $value;
+                }
+            } else {
+                $msg .= "\r\n{$name}: " . implode(', ', $values);
+            }
+        }
+
+        return "{$msg}\r\n\r\n" . $message->getBody();
+    }
+
+    /**
+     * Get a short summary of the message body.
+     *
+     * Will return `null` if the response is not printable.
+     *
+     * @param MessageInterface $message    The message to get the body summary
+     * @param int              $truncateAt The maximum allowed size of the summary
+     *
+     * @return string|null
+     */
+    public static function bodySummary(MessageInterface $message, $truncateAt = 120)
+    {
+        $body = $message->getBody();
+
+        if (!$body->isSeekable() || !$body->isReadable()) {
+            return null;
+        }
+
+        $size = $body->getSize();
+
+        if ($size === 0) {
+            return null;
+        }
+
+        $summary = $body->read($truncateAt);
+        $body->rewind();
+
+        if ($size > $truncateAt) {
+            $summary .= ' (truncated...)';
+        }
+
+        // Matches any printable character, including unicode characters:
+        // letters, marks, numbers, punctuation, spacing, and separators.
+        if (preg_match('/[^\pL\pM\pN\pP\pS\pZ\n\r\t]/u', $summary)) {
+            return null;
+        }
+
+        return $summary;
+    }
+
+    /**
+     * Attempts to rewind a message body and throws an exception on failure.
+     *
+     * The body of the message will only be rewound if a call to `tell()`
+     * returns a value other than `0`.
+     *
+     * @param MessageInterface $message Message to rewind
+     *
+     * @throws \RuntimeException
+     */
+    public static function rewindBody(MessageInterface $message)
+    {
+        $body = $message->getBody();
+
+        if ($body->tell()) {
+            $body->rewind();
+        }
+    }
+
+    /**
+     * Parses an HTTP message into an associative array.
+     *
+     * The array contains the "start-line" key containing the start line of
+     * the message, "headers" key containing an associative array of header
+     * array values, and a "body" key containing the body of the message.
+     *
+     * @param string $message HTTP request or response to parse.
+     *
+     * @return array
+     */
+    public static function parseMessage($message)
+    {
+        if (!$message) {
+            throw new \InvalidArgumentException('Invalid message');
+        }
+
+        $message = ltrim($message, "\r\n");
+
+        $messageParts = preg_split("/\r?\n\r?\n/", $message, 2);
+
+        if ($messageParts === false || count($messageParts) !== 2) {
+            throw new \InvalidArgumentException('Invalid message: Missing header delimiter');
+        }
+
+        list($rawHeaders, $body) = $messageParts;
+        $rawHeaders .= "\r\n"; // Put back the delimiter we split previously
+        $headerParts = preg_split("/\r?\n/", $rawHeaders, 2);
+
+        if ($headerParts === false || count($headerParts) !== 2) {
+            throw new \InvalidArgumentException('Invalid message: Missing status line');
+        }
+
+        list($startLine, $rawHeaders) = $headerParts;
+
+        if (preg_match("/(?:^HTTP\/|^[A-Z]+ \S+ HTTP\/)(\d+(?:\.\d+)?)/i", $startLine, $matches) && $matches[1] === '1.0') {
+            // Header folding is deprecated for HTTP/1.1, but allowed in HTTP/1.0
+            $rawHeaders = preg_replace(Rfc7230::HEADER_FOLD_REGEX, ' ', $rawHeaders);
+        }
+
+        /** @var array[] $headerLines */
+        $count = preg_match_all(Rfc7230::HEADER_REGEX, $rawHeaders, $headerLines, PREG_SET_ORDER);
+
+        // If these aren't the same, then one line didn't match and there's an invalid header.
+        if ($count !== substr_count($rawHeaders, "\n")) {
+            // Folding is deprecated, see https://tools.ietf.org/html/rfc7230#section-3.2.4
+            if (preg_match(Rfc7230::HEADER_FOLD_REGEX, $rawHeaders)) {
+                throw new \InvalidArgumentException('Invalid header syntax: Obsolete line folding');
+            }
+
+            throw new \InvalidArgumentException('Invalid header syntax');
+        }
+
+        $headers = [];
+
+        foreach ($headerLines as $headerLine) {
+            $headers[$headerLine[1]][] = $headerLine[2];
+        }
+
+        return [
+            'start-line' => $startLine,
+            'headers' => $headers,
+            'body' => $body,
+        ];
+    }
+
+    /**
+     * Constructs a URI for an HTTP request message.
+     *
+     * @param string $path    Path from the start-line
+     * @param array  $headers Array of headers (each value an array).
+     *
+     * @return string
+     */
+    public static function parseRequestUri($path, array $headers)
+    {
+        $hostKey = array_filter(array_keys($headers), function ($k) {
+            return strtolower($k) === 'host';
+        });
+
+        // If no host is found, then a full URI cannot be constructed.
+        if (!$hostKey) {
+            return $path;
+        }
+
+        $host = $headers[reset($hostKey)][0];
+        $scheme = substr($host, -4) === ':443' ? 'https' : 'http';
+
+        return $scheme . '://' . $host . '/' . ltrim($path, '/');
+    }
+
+    /**
+     * Parses a request message string into a request object.
+     *
+     * @param string $message Request message string.
+     *
+     * @return Request
+     */
+    public static function parseRequest($message)
+    {
+        $data = self::parseMessage($message);
+        $matches = [];
+        if (!preg_match('/^[\S]+\s+([a-zA-Z]+:\/\/|\/).*/', $data['start-line'], $matches)) {
+            throw new \InvalidArgumentException('Invalid request string');
+        }
+        $parts = explode(' ', $data['start-line'], 3);
+        $version = isset($parts[2]) ? explode('/', $parts[2])[1] : '1.1';
+
+        $request = new Request(
+            $parts[0],
+            $matches[1] === '/' ? self::parseRequestUri($parts[1], $data['headers']) : $parts[1],
+            $data['headers'],
+            $data['body'],
+            $version
+        );
+
+        return $matches[1] === '/' ? $request : $request->withRequestTarget($parts[1]);
+    }
+
+    /**
+     * Parses a response message string into a response object.
+     *
+     * @param string $message Response message string.
+     *
+     * @return Response
+     */
+    public static function parseResponse($message)
+    {
+        $data = self::parseMessage($message);
+        // According to https://tools.ietf.org/html/rfc7230#section-3.1.2 the space
+        // between status-code and reason-phrase is required. But browsers accept
+        // responses without space and reason as well.
+        if (!preg_match('/^HTTP\/.* [0-9]{3}( .*|$)/', $data['start-line'])) {
+            throw new \InvalidArgumentException('Invalid response string: ' . $data['start-line']);
+        }
+        $parts = explode(' ', $data['start-line'], 3);
+
+        return new Response(
+            (int) $parts[1],
+            $data['headers'],
+            $data['body'],
+            explode('/', $parts[0])[1],
+            isset($parts[2]) ? $parts[2] : null
+        );
+    }
+}
--- a/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/MessageTrait.php
+++ b/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/MessageTrait.php
@@ -0,0 +1,214 @@
+<?php
+
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * Trait implementing functionality common to requests and responses.
+ */
+trait MessageTrait
+{
+    /** @var array Map of all registered headers, as original name => array of values */
+    private $headers = [];
+
+    /** @var array Map of lowercase header name => original name at registration */
+    private $headerNames  = [];
+
+    /** @var string */
+    private $protocol = '1.1';
+
+    /** @var StreamInterface|null */
+    private $stream;
+
+    public function getProtocolVersion()
+    {
+        return $this->protocol;
+    }
+
+    public function withProtocolVersion($version)
+    {
+        if ($this->protocol === $version) {
+            return $this;
+        }
+
+        $new = clone $this;
+        $new->protocol = $version;
+        return $new;
+    }
+
+    public function getHeaders()
+    {
+        return $this->headers;
+    }
+
+    public function hasHeader($header)
+    {
+        return isset($this->headerNames[strtolower($header)]);
+    }
+
+    public function getHeader($header)
+    {
+        $header = strtolower($header);
+
+        if (!isset($this->headerNames[$header])) {
+            return [];
+        }
+
+        $header = $this->headerNames[$header];
+
+        return $this->headers[$header];
+    }
+
+    public function getHeaderLine($header)
+    {
+        return implode(', ', $this->getHeader($header));
+    }
+
+    public function withHeader($header, $value)
+    {
+        $this->assertHeader($header);
+        $value = $this->normalizeHeaderValue($value);
+        $normalized = strtolower($header);
+
+        $new = clone $this;
+        if (isset($new->headerNames[$normalized])) {
+            unset($new->headers[$new->headerNames[$normalized]]);
+        }
+        $new->headerNames[$normalized] = $header;
+        $new->headers[$header] = $value;
+
+        return $new;
+    }
+
+    public function withAddedHeader($header, $value)
+    {
+        $this->assertHeader($header);
+        $value = $this->normalizeHeaderValue($value);
+        $normalized = strtolower($header);
+
+        $new = clone $this;
+        if (isset($new->headerNames[$normalized])) {
+            $header = $this->headerNames[$normalized];
+            $new->headers[$header] = array_merge($this->headers[$header], $value);
+        } else {
+            $new->headerNames[$normalized] = $header;
+            $new->headers[$header] = $value;
+        }
+
+        return $new;
+    }
+
+    public function withoutHeader($header)
+    {
+        $normalized = strtolower($header);
+
+        if (!isset($this->headerNames[$normalized])) {
+            return $this;
+        }
+
+        $header = $this->headerNames[$normalized];
+
+        $new = clone $this;
+        unset($new->headers[$header], $new->headerNames[$normalized]);
+
+        return $new;
+    }
+
+    public function getBody()
+    {
+        if (!$this->stream) {
+            $this->stream = Utils::streamFor('');
+        }
+
+        return $this->stream;
+    }
+
+    public function withBody(StreamInterface $body)
+    {
+        if ($body === $this->stream) {
+            return $this;
+        }
+
+        $new = clone $this;
+        $new->stream = $body;
+        return $new;
+    }
+
+    private function setHeaders(array $headers)
+    {
+        $this->headerNames = $this->headers = [];
+        foreach ($headers as $header => $value) {
+            if (is_int($header)) {
+                // Numeric array keys are converted to int by PHP but having a header name '123' is not forbidden by the spec
+                // and also allowed in withHeader(). So we need to cast it to string again for the following assertion to pass.
+                $header = (string) $header;
+            }
+            $this->assertHeader($header);
+            $value = $this->normalizeHeaderValue($value);
+            $normalized = strtolower($header);
+            if (isset($this->headerNames[$normalized])) {
+                $header = $this->headerNames[$normalized];
+                $this->headers[$header] = array_merge($this->headers[$header], $value);
+            } else {
+                $this->headerNames[$normalized] = $header;
+                $this->headers[$header] = $value;
+            }
+        }
+    }
+
+    private function normalizeHeaderValue($value)
+    {
+        if (!is_array($value)) {
+            return $this->trimHeaderValues([$value]);
+        }
+
+        if (count($value) === 0) {
+            throw new \InvalidArgumentException('Header value can not be an empty array.');
+        }
+
+        return $this->trimHeaderValues($value);
+    }
+
+    /**
+     * Trims whitespace from the header values.
+     *
+     * Spaces and tabs ought to be excluded by parsers when extracting the field value from a header field.
+     *
+     * header-field = field-name ":" OWS field-value OWS
+     * OWS          = *( SP / HTAB )
+     *
+     * @param string[] $values Header values
+     *
+     * @return string[] Trimmed header values
+     *
+     * @see https://tools.ietf.org/html/rfc7230#section-3.2.4
+     */
+    private function trimHeaderValues(array $values)
+    {
+        return array_map(function ($value) {
+            if (!is_scalar($value) && null !== $value) {
+                throw new \InvalidArgumentException(sprintf(
+                    'Header value must be scalar or null but %s provided.',
+                    is_object($value) ? get_class($value) : gettype($value)
+                ));
+            }
+
+            return trim((string) $value, " \t");
+        }, array_values($values));
+    }
+
+    private function assertHeader($header)
+    {
+        if (!is_string($header)) {
+            throw new \InvalidArgumentException(sprintf(
+                'Header name must be a string but %s provided.',
+                is_object($header) ? get_class($header) : gettype($header)
+            ));
+        }
+
+        if ($header === '') {
+            throw new \InvalidArgumentException('Header name can not be empty.');
+        }
+    }
+}
--- a/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/MimeType.php
+++ b/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/MimeType.php
@@ -0,0 +1,140 @@
+<?php
+
+namespace GuzzleHttp\Psr7;
+
+final class MimeType
+{
+    /**
+     * Determines the mimetype of a file by looking at its extension.
+     *
+     * @param string $filename
+     *
+     * @return string|null
+     */
+    public static function fromFilename($filename)
+    {
+        return self::fromExtension(pathinfo($filename, PATHINFO_EXTENSION));
+    }
+
+    /**
+     * Maps a file extensions to a mimetype.
+     *
+     * @param string $extension string The file extension.
+     *
+     * @return string|null
+     *
+     * @link http://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x/conf/mime.types
+     */
+    public static function fromExtension($extension)
+    {
+        static $mimetypes = [
+            '3gp' => 'video/3gpp',
+            '7z' => 'application/x-7z-compressed',
+            'aac' => 'audio/x-aac',
+            'ai' => 'application/postscript',
+            'aif' => 'audio/x-aiff',
+            'asc' => 'text/plain',
+            'asf' => 'video/x-ms-asf',
+            'atom' => 'application/atom+xml',
+            'avi' => 'video/x-msvideo',
+            'bmp' => 'image/bmp',
+            'bz2' => 'application/x-bzip2',
+            'cer' => 'application/pkix-cert',
+            'crl' => 'application/pkix-crl',
+            'crt' => 'application/x-x509-ca-cert',
+            'css' => 'text/css',
+            'csv' => 'text/csv',
+            'cu' => 'application/cu-seeme',
+            'deb' => 'application/x-debian-package',
+            'doc' => 'application/msword',
+            'docx' => 'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
+            'dvi' => 'application/x-dvi',
+            'eot' => 'application/vnd.ms-fontobject',
+            'eps' => 'application/postscript',
+            'epub' => 'application/epub+zip',
+            'etx' => 'text/x-setext',
+            'flac' => 'audio/flac',
+            'flv' => 'video/x-flv',
+            'gif' => 'image/gif',
+            'gz' => 'application/gzip',
+            'htm' => 'text/html',
+            'html' => 'text/html',
+            'ico' => 'image/x-icon',
+            'ics' => 'text/calendar',
+            'ini' => 'text/plain',
+            'iso' => 'application/x-iso9660-image',
+            'jar' => 'application/java-archive',
+            'jpe' => 'image/jpeg',
+            'jpeg' => 'image/jpeg',
+            'jpg' => 'image/jpeg',
+            'js' => 'text/javascript',
+            'json' => 'application/json',
+            'latex' => 'application/x-latex',
+            'log' => 'text/plain',
+            'm4a' => 'audio/mp4',
+            'm4v' => 'video/mp4',
+            'mid' => 'audio/midi',
+            'midi' => 'audio/midi',
+            'mov' => 'video/quicktime',
+            'mkv' => 'video/x-matroska',
+            'mp3' => 'audio/mpeg',
+            'mp4' => 'video/mp4',
+            'mp4a' => 'audio/mp4',
+            'mp4v' => 'video/mp4',
+            'mpe' => 'video/mpeg',
+            'mpeg' => 'video/mpeg',
+            'mpg' => 'video/mpeg',
+            'mpg4' => 'video/mp4',
+            'oga' => 'audio/ogg',
+            'ogg' => 'audio/ogg',
+            'ogv' => 'video/ogg',
+            'ogx' => 'application/ogg',
+            'pbm' => 'image/x-portable-bitmap',
+            'pdf' => 'application/pdf',
+            'pgm' => 'image/x-portable-graymap',
+            'png' => 'image/png',
+            'pnm' => 'image/x-portable-anymap',
+            'ppm' => 'image/x-portable-pixmap',
+            'ppt' => 'application/vnd.ms-powerpoint',
+            'pptx' => 'application/vnd.openxmlformats-officedocument.presentationml.presentation',
+            'ps' => 'application/postscript',
+            'qt' => 'video/quicktime',
+            'rar' => 'application/x-rar-compressed',
+            'ras' => 'image/x-cmu-raster',
+            'rss' => 'application/rss+xml',
+            'rtf' => 'application/rtf',
+            'sgm' => 'text/sgml',
+            'sgml' => 'text/sgml',
+            'svg' => 'image/svg+xml',
+            'swf' => 'application/x-shockwave-flash',
+            'tar' => 'application/x-tar',
+            'tif' => 'image/tiff',
+            'tiff' => 'image/tiff',
+            'torrent' => 'application/x-bittorrent',
+            'ttf' => 'application/x-font-ttf',
+            'txt' => 'text/plain',
+            'wav' => 'audio/x-wav',
+            'webm' => 'video/webm',
+            'webp' => 'image/webp',
+            'wma' => 'audio/x-ms-wma',
+            'wmv' => 'video/x-ms-wmv',
+            'woff' => 'application/x-font-woff',
+            'wsdl' => 'application/wsdl+xml',
+            'xbm' => 'image/x-xbitmap',
+            'xls' => 'application/vnd.ms-excel',
+            'xlsx' => 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
+            'xml' => 'application/xml',
+            'xpm' => 'image/x-xpixmap',
+            'xwd' => 'image/x-xwindowdump',
+            'yaml' => 'text/yaml',
+            'yml' => 'text/yaml',
+            'zip' => 'application/zip',
+        ];
+
+        $extension = strtolower($extension);
+
+        return isset($mimetypes[$extension])
+            ? $mimetypes[$extension]
+            : null;
+    }
+}
--- a/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/MultipartStream.php
+++ b/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/MultipartStream.php
@@ -0,0 +1,154 @@
+<?php
+
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * Stream that when read returns bytes for a streaming multipart or
+ * multipart/form-data stream.
+ */
+class MultipartStream implements StreamInterface
+{
+    use StreamDecoratorTrait;
+
+    private $boundary;
+
+    /**
+     * @param array  $elements Array of associative arrays, each containing a
+     *                         required "name" key mapping to the form field,
+     *                         name, a required "contents" key mapping to a
+     *                         StreamInterface/resource/string, an optional
+     *                         "headers" associative array of custom headers,
+     *                         and an optional "filename" key mapping to a
+     *                         string to send as the filename in the part.
+     * @param string $boundary You can optionally provide a specific boundary
+     *
+     * @throws \InvalidArgumentException
+     */
+    public function __construct(array $elements = [], $boundary = null)
+    {
+        $this->boundary = $boundary ?: sha1(uniqid('', true));
+        $this->stream = $this->createStream($elements);
+    }
+
+    /**
+     * Get the boundary
+     *
+     * @return string
+     */
+    public function getBoundary()
+    {
+        return $this->boundary;
+    }
+
+    public function isWritable()
+    {
+        return false;
+    }
+
+    /**
+     * Get the headers needed before transferring the content of a POST file
+     */
+    private function getHeaders(array $headers)
+    {
+        $str = '';
+        foreach ($headers as $key => $value) {
+            $str .= "{$key}: {$value}\r\n";
+        }
+
+        return "--{$this->boundary}\r\n" . trim($str) . "\r\n\r\n";
+    }
+
+    /**
+     * Create the aggregate stream that will be used to upload the POST data
+     */
+    protected function createStream(array $elements)
+    {
+        $stream = new AppendStream();
+
+        foreach ($elements as $element) {
+            $this->addElement($stream, $element);
+        }
+
+        // Add the trailing boundary with CRLF
+        $stream->addStream(Utils::streamFor("--{$this->boundary}--\r\n"));
+
+        return $stream;
+    }
+
+    private function addElement(AppendStream $stream, array $element)
+    {
+        foreach (['contents', 'name'] as $key) {
+            if (!array_key_exists($key, $element)) {
+                throw new \InvalidArgumentException("A '{$key}' key is required");
+            }
+        }
+
+        $element['contents'] = Utils::streamFor($element['contents']);
+
+        if (empty($element['filename'])) {
+            $uri = $element['contents']->getMetadata('uri');
+            if (substr($uri, 0, 6) !== 'php://') {
+                $element['filename'] = $uri;
+            }
+        }
+
+        list($body, $headers) = $this->createElement(
+            $element['name'],
+            $element['contents'],
+            isset($element['filename']) ? $element['filename'] : null,
+            isset($element['headers']) ? $element['headers'] : []
+        );
+
+        $stream->addStream(Utils::streamFor($this->getHeaders($headers)));
+        $stream->addStream($body);
+        $stream->addStream(Utils::streamFor("\r\n"));
+    }
+
+    /**
+     * @return array
+     */
+    private function createElement($name, StreamInterface $stream, $filename, array $headers)
+    {
+        // Set a default content-disposition header if one was no provided
+        $disposition = $this->getHeader($headers, 'content-disposition');
+        if (!$disposition) {
+            $headers['Content-Disposition'] = ($filename === '0' || $filename)
+                ? sprintf('form-data; name="%s"; filename="%s"',
+                    $name,
+                    basename($filename))
+                : "form-data; name=\"{$name}\"";
+        }
+
+        // Set a default content-length header if one was no provided
+        $length = $this->getHeader($headers, 'content-length');
+        if (!$length) {
+            if ($length = $stream->getSize()) {
+                $headers['Content-Length'] = (string) $length;
+            }
+        }
+
+        // Set a default Content-Type if one was not supplied
+        $type = $this->getHeader($headers, 'content-type');
+        if (!$type && ($filename === '0' || $filename)) {
+            if ($type = MimeType::fromFilename($filename)) {
+                $headers['Content-Type'] = $type;
+            }
+        }
+
+        return [$stream, $headers];
+    }
+
+    private function getHeader(array $headers, $key)
+    {
+        $lowercaseHeader = strtolower($key);
+        foreach ($headers as $k => $v) {
+            if (strtolower($k) === $lowercaseHeader) {
+                return $v;
+            }
+        }
+
+        return null;
+    }
+}
--- a/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/NoSeekStream.php
+++ b/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/NoSeekStream.php
@@ -0,0 +1,23 @@
+<?php
+
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * Stream decorator that prevents a stream from being seeked
+ */
+class NoSeekStream implements StreamInterface
+{
+    use StreamDecoratorTrait;
+
+    public function seek($offset, $whence = SEEK_SET)
+    {
+        throw new \RuntimeException('Cannot seek a NoSeekStream');
+    }
+
+    public function isSeekable()
+    {
+        return false;
+    }
+}
--- a/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/PumpStream.php
+++ b/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/PumpStream.php
@@ -0,0 +1,168 @@
+<?php
+
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * Provides a read only stream that pumps data from a PHP callable.
+ *
+ * When invoking the provided callable, the PumpStream will pass the amount of
+ * data requested to read to the callable. The callable can choose to ignore
+ * this value and return fewer or more bytes than requested. Any extra data
+ * returned by the provided callable is buffered internally until drained using
+ * the read() function of the PumpStream. The provided callable MUST return
+ * false when there is no more data to read.
+ */
+class PumpStream implements StreamInterface
+{
+    /** @var callable */
+    private $source;
+
+    /** @var int */
+    private $size;
+
+    /** @var int */
+    private $tellPos = 0;
+
+    /** @var array */
+    private $metadata;
+
+    /** @var BufferStream */
+    private $buffer;
+
+    /**
+     * @param callable $source Source of the stream data. The callable MAY
+     *                         accept an integer argument used to control the
+     *                         amount of data to return. The callable MUST
+     *                         return a string when called, or false on error
+     *                         or EOF.
+     * @param array $options   Stream options:
+     *                         - metadata: Hash of metadata to use with stream.
+     *                         - size: Size of the stream, if known.
+     */
+    public function __construct(callable $source, array $options = [])
+    {
+        $this->source = $source;
+        $this->size = isset($options['size']) ? $options['size'] : null;
+        $this->metadata = isset($options['metadata']) ? $options['metadata'] : [];
+        $this->buffer = new BufferStream();
+    }
+
+    public function __toString()
+    {
+        try {
+            return Utils::copyToString($this);
+        } catch (\Exception $e) {
+            return '';
+        }
+    }
+
+    public function close()
+    {
+        $this->detach();
+    }
+
+    public function detach()
+    {
+        $this->tellPos = false;
+        $this->source = null;
+
+        return null;
+    }
+
+    public function getSize()
+    {
+        return $this->size;
+    }
+
+    public function tell()
+    {
+        return $this->tellPos;
+    }
+
+    public function eof()
+    {
+        return !$this->source;
+    }
+
+    public function isSeekable()
+    {
+        return false;
+    }
+
+    public function rewind()
+    {
+        $this->seek(0);
+    }
+
+    public function seek($offset, $whence = SEEK_SET)
+    {
+        throw new \RuntimeException('Cannot seek a PumpStream');
+    }
+
+    public function isWritable()
+    {
+        return false;
+    }
+
+    public function write($string)
+    {
+        throw new \RuntimeException('Cannot write to a PumpStream');
+    }
+
+    public function isReadable()
+    {
+        return true;
+    }
+
+    public function read($length)
+    {
+        $data = $this->buffer->read($length);
+        $readLen = strlen($data);
+        $this->tellPos += $readLen;
+        $remaining = $length - $readLen;
+
+        if ($remaining) {
+            $this->pump($remaining);
+            $data .= $this->buffer->read($remaining);
+            $this->tellPos += strlen($data) - $readLen;
+        }
+
+        return $data;
+    }
+
+    public function getContents()
+    {
+        $result = '';
+        while (!$this->eof()) {
+            $result .= $this->read(1000000);
+        }
+
+        return $result;
+    }
+
+    public function getMetadata($key = null)
+    {
+        if (!$key) {
+            return $this->metadata;
+        }
+
+        return isset($this->metadata[$key]) ? $this->metadata[$key] : null;
+    }
+
+    private function pump($length)
+    {
+        if ($this->source) {
+            do {
+                $data = call_user_func($this->source, $length);
+                if ($data === false || $data === null) {
+                    $this->source = null;
+                    return;
+                }
+                $this->buffer->write($data);
+                $length -= strlen($data);
+            } while ($length > 0);
+        }
+    }
+}
--- a/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/Query.php
+++ b/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/Query.php
@@ -0,0 +1,108 @@
+<?php
+
+namespace GuzzleHttp\Psr7;
+
+final class Query
+{
+    /**
+     * Parse a query string into an associative array.
+     *
+     * If multiple values are found for the same key, the value of that key
+     * value pair will become an array. This function does not parse nested
+     * PHP style arrays into an associative array (e.g., `foo[a]=1&foo[b]=2`
+     * will be parsed into `['foo[a]' => '1', 'foo[b]' => '2'])`.
+     *
+     * @param string   $str         Query string to parse
+     * @param int|bool $urlEncoding How the query string is encoded
+     *
+     * @return array
+     */
+    public static function parse($str, $urlEncoding = true)
+    {
+        $result = [];
+
+        if ($str === '') {
+            return $result;
+        }
+
+        if ($urlEncoding === true) {
+            $decoder = function ($value) {
+                return rawurldecode(str_replace('+', ' ', $value));
+            };
+        } elseif ($urlEncoding === PHP_QUERY_RFC3986) {
+            $decoder = 'rawurldecode';
+        } elseif ($urlEncoding === PHP_QUERY_RFC1738) {
+            $decoder = 'urldecode';
+        } else {
+            $decoder = function ($str) { return $str; };
+        }
+
+        foreach (explode('&', $str) as $kvp) {
+            $parts = explode('=', $kvp, 2);
+            $key = $decoder($parts[0]);
+            $value = isset($parts[1]) ? $decoder($parts[1]) : null;
+            if (!isset($result[$key])) {
+                $result[$key] = $value;
+            } else {
+                if (!is_array($result[$key])) {
+                    $result[$key] = [$result[$key]];
+                }
+                $result[$key][] = $value;
+            }
+        }
+
+        return $result;
+    }
+
+    /**
+     * Build a query string from an array of key value pairs.
+     *
+     * This function can use the return value of `parse()` to build a query
+     * string. This function does not modify the provided keys when an array is
+     * encountered (like `http_build_query()` would).
+     *
+     * @param array     $params   Query string parameters.
+     * @param int|false $encoding Set to false to not encode, PHP_QUERY_RFC3986
+     *                            to encode using RFC3986, or PHP_QUERY_RFC1738
+     *                            to encode using RFC1738.
+     * @return string
+     */
+    public static function build(array $params, $encoding = PHP_QUERY_RFC3986)
+    {
+        if (!$params) {
+            return '';
+        }
+
+        if ($encoding === false) {
+            $encoder = function ($str) { return $str; };
+        } elseif ($encoding === PHP_QUERY_RFC3986) {
+            $encoder = 'rawurlencode';
+        } elseif ($encoding === PHP_QUERY_RFC1738) {
+            $encoder = 'urlencode';
+        } else {
+            throw new \InvalidArgumentException('Invalid type');
+        }
+
+        $qs = '';
+        foreach ($params as $k => $v) {
+            $k = $encoder($k);
+            if (!is_array($v)) {
+                $qs .= $k;
+                if ($v !== null) {
+                    $qs .= '=' . $encoder($v);
+                }
+                $qs .= '&';
+            } else {
+                foreach ($v as $vv) {
+                    $qs .= $k;
+                    if ($vv !== null) {
+                        $qs .= '=' . $encoder($vv);
+                    }
+                    $qs .= '&';
+                }
+            }
+        }
+
+        return $qs ? (string) substr($qs, 0, -1) : '';
+    }
+}
--- a/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/Request.php
+++ b/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/Request.php
@@ -0,0 +1,152 @@
+<?php
+
+namespace GuzzleHttp\Psr7;
+
+use InvalidArgumentException;
+use Psr\Http\Message\RequestInterface;
+use Psr\Http\Message\StreamInterface;
+use Psr\Http\Message\UriInterface;
+
+/**
+ * PSR-7 request implementation.
+ */
+class Request implements RequestInterface
+{
+    use MessageTrait;
+
+    /** @var string */
+    private $method;
+
+    /** @var null|string */
+    private $requestTarget;
+
+    /** @var UriInterface */
+    private $uri;
+
+    /**
+     * @param string                               $method  HTTP method
+     * @param string|UriInterface                  $uri     URI
+     * @param array                                $headers Request headers
+     * @param string|null|resource|StreamInterface $body    Request body
+     * @param string                               $version Protocol version
+     */
+    public function __construct(
+        $method,
+        $uri,
+        array $headers = [],
+        $body = null,
+        $version = '1.1'
+    ) {
+        $this->assertMethod($method);
+        if (!($uri instanceof UriInterface)) {
+            $uri = new Uri($uri);
+        }
+
+        $this->method = strtoupper($method);
+        $this->uri = $uri;
+        $this->setHeaders($headers);
+        $this->protocol = $version;
+
+        if (!isset($this->headerNames['host'])) {
+            $this->updateHostFromUri();
+        }
+
+        if ($body !== '' && $body !== null) {
+            $this->stream = Utils::streamFor($body);
+        }
+    }
+
+    public function getRequestTarget()
+    {
+        if ($this->requestTarget !== null) {
+            return $this->requestTarget;
+        }
+
+        $target = $this->uri->getPath();
+        if ($target == '') {
+            $target = '/';
+        }
+        if ($this->uri->getQuery() != '') {
+            $target .= '?' . $this->uri->getQuery();
+        }
+
+        return $target;
+    }
+
+    public function withRequestTarget($requestTarget)
+    {
+        if (preg_match('#\s#', $requestTarget)) {
+            throw new InvalidArgumentException(
+                'Invalid request target provided; cannot contain whitespace'
+            );
+        }
+
+        $new = clone $this;
+        $new->requestTarget = $requestTarget;
+        return $new;
+    }
+
+    public function getMethod()
+    {
+        return $this->method;
+    }
+
+    public function withMethod($method)
+    {
+        $this->assertMethod($method);
+        $new = clone $this;
+        $new->method = strtoupper($method);
+        return $new;
+    }
+
+    public function getUri()
+    {
+        return $this->uri;
+    }
+
+    public function withUri(UriInterface $uri, $preserveHost = false)
+    {
+        if ($uri === $this->uri) {
+            return $this;
+        }
+
+        $new = clone $this;
+        $new->uri = $uri;
+
+        if (!$preserveHost || !isset($this->headerNames['host'])) {
+            $new->updateHostFromUri();
+        }
+
+        return $new;
+    }
+
+    private function updateHostFromUri()
+    {
+        $host = $this->uri->getHost();
+
+        if ($host == '') {
+            return;
+        }
+
+        if (($port = $this->uri->getPort()) !== null) {
+            $host .= ':' . $port;
+        }
+
+        if (isset($this->headerNames['host'])) {
+            $header = $this->headerNames['host'];
+        } else {
+            $header = 'Host';
+            $this->headerNames['host'] = 'Host';
+        }
+        // Ensure Host is the first header.
+        // See: http://tools.ietf.org/html/rfc7230#section-5.4
+        $this->headers = [$header => [$host]] + $this->headers;
+    }
+
+    private function assertMethod($method)
+    {
+        if (!is_string($method) || $method === '') {
+            throw new \InvalidArgumentException('Method must be a non-empty string.');
+        }
+    }
+}
--- a/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/Response.php
+++ b/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/Response.php
@@ -0,0 +1,155 @@
+<?php
+
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * PSR-7 response implementation.
+ */
+class Response implements ResponseInterface
+{
+    use MessageTrait;
+
+    /** @var array Map of standard HTTP status code/reason phrases */
+    private static $phrases = [
+        100 => 'Continue',
+        101 => 'Switching Protocols',
+        102 => 'Processing',
+        200 => 'OK',
+        201 => 'Created',
+        202 => 'Accepted',
+        203 => 'Non-Authoritative Information',
+        204 => 'No Content',
+        205 => 'Reset Content',
+        206 => 'Partial Content',
+        207 => 'Multi-status',
+        208 => 'Already Reported',
+        300 => 'Multiple Choices',
+        301 => 'Moved Permanently',
+        302 => 'Found',
+        303 => 'See Other',
+        304 => 'Not Modified',
+        305 => 'Use Proxy',
+        306 => 'Switch Proxy',
+        307 => 'Temporary Redirect',
+        400 => 'Bad Request',
+        401 => 'Unauthorized',
+        402 => 'Payment Required',
+        403 => 'Forbidden',
+        404 => 'Not Found',
+        405 => 'Method Not Allowed',
+        406 => 'Not Acceptable',
+        407 => 'Proxy Authentication Required',
+        408 => 'Request Time-out',
+        409 => 'Conflict',
+        410 => 'Gone',
+        411 => 'Length Required',
+        412 => 'Precondition Failed',
+        413 => 'Request Entity Too Large',
+        414 => 'Request-URI Too Large',
+        415 => 'Unsupported Media Type',
+        416 => 'Requested range not satisfiable',
+        417 => 'Expectation Failed',
+        418 => 'I\'m a teapot',
+        422 => 'Unprocessable Entity',
+        423 => 'Locked',
+        424 => 'Failed Dependency',
+        425 => 'Unordered Collection',
+        426 => 'Upgrade Required',
+        428 => 'Precondition Required',
+        429 => 'Too Many Requests',
+        431 => 'Request Header Fields Too Large',
+        451 => 'Unavailable For Legal Reasons',
+        500 => 'Internal Server Error',
+        501 => 'Not Implemented',
+        502 => 'Bad Gateway',
+        503 => 'Service Unavailable',
+        504 => 'Gateway Time-out',
+        505 => 'HTTP Version not supported',
+        506 => 'Variant Also Negotiates',
+        507 => 'Insufficient Storage',
+        508 => 'Loop Detected',
+        511 => 'Network Authentication Required',
+    ];
+
+    /** @var string */
+    private $reasonPhrase = '';
+
+    /** @var int */
+    private $statusCode = 200;
+
+    /**
+     * @param int                                  $status  Status code
+     * @param array                                $headers Response headers
+     * @param string|null|resource|StreamInterface $body    Response body
+     * @param string                               $version Protocol version
+     * @param string|null                          $reason  Reason phrase (when empty a default will be used based on the status code)
+     */
+    public function __construct(
+        $status = 200,
+        array $headers = [],
+        $body = null,
+        $version = '1.1',
+        $reason = null
+    ) {
+        $this->assertStatusCodeIsInteger($status);
+        $status = (int) $status;
+        $this->assertStatusCodeRange($status);
+
+        $this->statusCode = $status;
+
+        if ($body !== '' && $body !== null) {
+            $this->stream = Utils::streamFor($body);
+        }
+
+        $this->setHeaders($headers);
+        if ($reason == '' && isset(self::$phrases[$this->statusCode])) {
+            $this->reasonPhrase = self::$phrases[$this->statusCode];
+        } else {
+            $this->reasonPhrase = (string) $reason;
+        }
+
+        $this->protocol = $version;
+    }
+
+    public function getStatusCode()
+    {
+        return $this->statusCode;
+    }
+
+    public function getReasonPhrase()
+    {
+        return $this->reasonPhrase;
+    }
+
+    public function withStatus($code, $reasonPhrase = '')
+    {
+        $this->assertStatusCodeIsInteger($code);
+        $code = (int) $code;
+        $this->assertStatusCodeRange($code);
+
+        $new = clone $this;
+        $new->statusCode = $code;
+        if ($reasonPhrase == '' && isset(self::$phrases[$new->statusCode])) {
+            $reasonPhrase = self::$phrases[$new->statusCode];
+        }
+        $new->reasonPhrase = (string) $reasonPhrase;
+        return $new;
+    }
+
+    private function assertStatusCodeIsInteger($statusCode)
+    {
+        if (filter_var($statusCode, FILTER_VALIDATE_INT) === false) {
+            throw new \InvalidArgumentException('Status code must be an integer value.');
+        }
+    }
+
+    private function assertStatusCodeRange($statusCode)
+    {
+        if ($statusCode < 100 || $statusCode >= 600) {
+            throw new \InvalidArgumentException('Status code must be an integer value between 1xx and 5xx.');
+        }
+    }
+}
--- a/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/Rfc7230.php
+++ b/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/Rfc7230.php
@@ -0,0 +1,18 @@
+<?php
+
+namespace GuzzleHttp\Psr7;
+
+final class Rfc7230
+{
+    /**
+     * Header related regular expressions (copied from amphp/http package)
+     * (Note: once we require PHP 7.x we could just depend on the upstream package)
+     *
+     * Note: header delimiter (\r\n) is modified to \r?\n to accept line feed only delimiters for BC reasons.
+     *
+     * @link    https://github.com/amphp/http/blob/v1.0.1/src/Rfc7230.php#L12-L15
+     * @license https://github.com/amphp/http/blob/v1.0.1/LICENSE
+     */
+    const HEADER_REGEX = "(^([^()<>@,;:\\\"/[\]?={}\x01-\x20\x7F]++):[ \t]*+((?:[ \t]*+[\x21-\x7E\x80-\xFF]++)*+)[ \t]*+\r?\n)m";
+    const HEADER_FOLD_REGEX = "(\r?\n[ \t]++)";
+}
--- a/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/ServerRequest.php
+++ b/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/ServerRequest.php
@@ -0,0 +1,378 @@
+<?php
+
+namespace GuzzleHttp\Psr7;
+
+use InvalidArgumentException;
+use Psr\Http\Message\ServerRequestInterface;
+use Psr\Http\Message\UriInterface;
+use Psr\Http\Message\StreamInterface;
+use Psr\Http\Message\UploadedFileInterface;
+
+/**
+ * Server-side HTTP request
+ *
+ * Extends the Request definition to add methods for accessing incoming data,
+ * specifically server parameters, cookies, matched path parameters, query
+ * string arguments, body parameters, and upload file information.
+ *
+ * "Attributes" are discovered via decomposing the request (and usually
+ * specifically the URI path), and typically will be injected by the application.
+ *
+ * Requests are considered immutable; all methods that might change state are
+ * implemented such that they retain the internal state of the current
+ * message and return a new instance that contains the changed state.
+ */
+class ServerRequest extends Request implements ServerRequestInterface
+{
+    /**
+     * @var array
+     */
+    private $attributes = [];
+
+    /**
+     * @var array
+     */
+    private $cookieParams = [];
+
+    /**
+     * @var null|array|object
+     */
+    private $parsedBody;
+
+    /**
+     * @var array
+     */
+    private $queryParams = [];
+
+    /**
+     * @var array
+     */
+    private $serverParams;
+
+    /**
+     * @var array
+     */
+    private $uploadedFiles = [];
+
+    /**
+     * @param string                               $method       HTTP method
+     * @param string|UriInterface                  $uri          URI
+     * @param array                                $headers      Request headers
+     * @param string|null|resource|StreamInterface $body         Request body
+     * @param string                               $version      Protocol version
+     * @param array                                $serverParams Typically the $_SERVER superglobal
+     */
+    public function __construct(
+        $method,
+        $uri,
+        array $headers = [],
+        $body = null,
+        $version = '1.1',
+        array $serverParams = []
+    ) {
+        $this->serverParams = $serverParams;
+
+        parent::__construct($method, $uri, $headers, $body, $version);
+    }
+
+    /**
+     * Return an UploadedFile instance array.
+     *
+     * @param array $files A array which respect $_FILES structure
+     *
+     * @return array
+     *
+     * @throws InvalidArgumentException for unrecognized values
+     */
+    public static function normalizeFiles(array $files)
+    {
+        $normalized = [];
+
+        foreach ($files as $key => $value) {
+            if ($value instanceof UploadedFileInterface) {
+                $normalized[$key] = $value;
+            } elseif (is_array($value) && isset($value['tmp_name'])) {
+                $normalized[$key] = self::createUploadedFileFromSpec($value);
+            } elseif (is_array($value)) {
+                $normalized[$key] = self::normalizeFiles($value);
+                continue;
+            } else {
+                throw new InvalidArgumentException('Invalid value in files specification');
+            }
+        }
+
+        return $normalized;
+    }
+
+    /**
+     * Create and return an UploadedFile instance from a $_FILES specification.
+     *
+     * If the specification represents an array of values, this method will
+     * delegate to normalizeNestedFileSpec() and return that return value.
+     *
+     * @param array $value $_FILES struct
+     * @return array|UploadedFileInterface
+     */
+    private static function createUploadedFileFromSpec(array $value)
+    {
+        if (is_array($value['tmp_name'])) {
+            return self::normalizeNestedFileSpec($value);
+        }
+
+        return new UploadedFile(
+            $value['tmp_name'],
+            (int) $value['size'],
+            (int) $value['error'],
+            $value['name'],
+            $value['type']
+        );
+    }
+
+    /**
+     * Normalize an array of file specifications.
+     *
+     * Loops through all nested files and returns a normalized array of
+     * UploadedFileInterface instances.
+     *
+     * @param array $files
+     * @return UploadedFileInterface[]
+     */
+    private static function normalizeNestedFileSpec(array $files = [])
+    {
+        $normalizedFiles = [];
+
+        foreach (array_keys($files['tmp_name']) as $key) {
+            $spec = [
+                'tmp_name' => $files['tmp_name'][$key],
+                'size'     => $files['size'][$key],
+                'error'    => $files['error'][$key],
+                'name'     => $files['name'][$key],
+                'type'     => $files['type'][$key],
+            ];
+            $normalizedFiles[$key] = self::createUploadedFileFromSpec($spec);
+        }
+
+        return $normalizedFiles;
+    }
+
+    /**
+     * Return a ServerRequest populated with superglobals:
+     * $_GET
+     * $_POST
+     * $_COOKIE
+     * $_FILES
+     * $_SERVER
+     *
+     * @return ServerRequestInterface
+     */
+    public static function fromGlobals()
+    {
+        $method = isset($_SERVER['REQUEST_METHOD']) ? $_SERVER['REQUEST_METHOD'] : 'GET';
+        $headers = getallheaders();
+        $uri = self::getUriFromGlobals();
+        $body = new CachingStream(new LazyOpenStream('php://input', 'r+'));
+        $protocol = isset($_SERVER['SERVER_PROTOCOL']) ? str_replace('HTTP/', '', $_SERVER['SERVER_PROTOCOL']) : '1.1';
+
+        $serverRequest = new ServerRequest($method, $uri, $headers, $body, $protocol, $_SERVER);
+
+        return $serverRequest
+            ->withCookieParams($_COOKIE)
+            ->withQueryParams($_GET)
+            ->withParsedBody($_POST)
+            ->withUploadedFiles(self::normalizeFiles($_FILES));
+    }
+
+    private static function extractHostAndPortFromAuthority($authority)
+    {
+        $uri = 'http://'.$authority;
+        $parts = parse_url($uri);
+        if (false === $parts) {
+            return [null, null];
+        }
+
+        $host = isset($parts['host']) ? $parts['host'] : null;
+        $port = isset($parts['port']) ? $parts['port'] : null;
+
+        return [$host, $port];
+    }
+
+    /**
+     * Get a Uri populated with values from $_SERVER.
+     *
+     * @return UriInterface
+     */
+    public static function getUriFromGlobals()
+    {
+        $uri = new Uri('');
+
+        $uri = $uri->withScheme(!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off' ? 'https' : 'http');
+
+        $hasPort = false;
+        if (isset($_SERVER['HTTP_HOST'])) {
+            list($host, $port) = self::extractHostAndPortFromAuthority($_SERVER['HTTP_HOST']);
+            if ($host !== null) {
+                $uri = $uri->withHost($host);
+            }
+
+            if ($port !== null) {
+                $hasPort = true;
+                $uri = $uri->withPort($port);
+            }
+        } elseif (isset($_SERVER['SERVER_NAME'])) {
+            $uri = $uri->withHost($_SERVER['SERVER_NAME']);
+        } elseif (isset($_SERVER['SERVER_ADDR'])) {
+            $uri = $uri->withHost($_SERVER['SERVER_ADDR']);
+        }
+
+        if (!$hasPort && isset($_SERVER['SERVER_PORT'])) {
+            $uri = $uri->withPort($_SERVER['SERVER_PORT']);
+        }
+
+        $hasQuery = false;
+        if (isset($_SERVER['REQUEST_URI'])) {
+            $requestUriParts = explode('?', $_SERVER['REQUEST_URI'], 2);
+            $uri = $uri->withPath($requestUriParts[0]);
+            if (isset($requestUriParts[1])) {
+                $hasQuery = true;
+                $uri = $uri->withQuery($requestUriParts[1]);
+            }
+        }
+
+        if (!$hasQuery && isset($_SERVER['QUERY_STRING'])) {
+            $uri = $uri->withQuery($_SERVER['QUERY_STRING']);
+        }
+
+        return $uri;
+    }
+
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getServerParams()
+    {
+        return $this->serverParams;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getUploadedFiles()
+    {
+        return $this->uploadedFiles;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function withUploadedFiles(array $uploadedFiles)
+    {
+        $new = clone $this;
+        $new->uploadedFiles = $uploadedFiles;
+
+        return $new;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getCookieParams()
+    {
+        return $this->cookieParams;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function withCookieParams(array $cookies)
+    {
+        $new = clone $this;
+        $new->cookieParams = $cookies;
+
+        return $new;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getQueryParams()
+    {
+        return $this->queryParams;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function withQueryParams(array $query)
+    {
+        $new = clone $this;
+        $new->queryParams = $query;
+
+        return $new;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getParsedBody()
+    {
+        return $this->parsedBody;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function withParsedBody($data)
+    {
+        $new = clone $this;
+        $new->parsedBody = $data;
+
+        return $new;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getAttributes()
+    {
+        return $this->attributes;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getAttribute($attribute, $default = null)
+    {
+        if (false === array_key_exists($attribute, $this->attributes)) {
+            return $default;
+        }
+
+        return $this->attributes[$attribute];
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function withAttribute($attribute, $value)
+    {
+        $new = clone $this;
+        $new->attributes[$attribute] = $value;
+
+        return $new;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function withoutAttribute($attribute)
+    {
+        if (false === array_key_exists($attribute, $this->attributes)) {
+            return $this;
+        }
+
+        $new = clone $this;
+        unset($new->attributes[$attribute]);
+
+        return $new;
+    }
+}
--- a/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/Stream.php
+++ b/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/Stream.php
@@ -0,0 +1,270 @@
+<?php
+
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * PHP stream implementation.
+ *
+ * @var $stream
+ */
+class Stream implements StreamInterface
+{
+    /**
+     * Resource modes.
+     *
+     * @var string
+     *
+     * @see http://php.net/manual/function.fopen.php
+     * @see http://php.net/manual/en/function.gzopen.php
+     */
+    const READABLE_MODES = '/r|a\+|ab\+|w\+|wb\+|x\+|xb\+|c\+|cb\+/';
+    const WRITABLE_MODES = '/a|w|r\+|rb\+|rw|x|c/';
+
+    private $stream;
+    private $size;
+    private $seekable;
+    private $readable;
+    private $writable;
+    private $uri;
+    private $customMetadata;
+
+    /**
+     * This constructor accepts an associative array of options.
+     *
+     * - size: (int) If a read stream would otherwise have an indeterminate
+     *   size, but the size is known due to foreknowledge, then you can
+     *   provide that size, in bytes.
+     * - metadata: (array) Any additional metadata to return when the metadata
+     *   of the stream is accessed.
+     *
+     * @param resource $stream  Stream resource to wrap.
+     * @param array    $options Associative array of options.
+     *
+     * @throws \InvalidArgumentException if the stream is not a stream resource
+     */
+    public function __construct($stream, $options = [])
+    {
+        if (!is_resource($stream)) {
+            throw new \InvalidArgumentException('Stream must be a resource');
+        }
+
+        if (isset($options['size'])) {
+            $this->size = $options['size'];
+        }
+
+        $this->customMetadata = isset($options['metadata'])
+            ? $options['metadata']
+            : [];
+
+        $this->stream = $stream;
+        $meta = stream_get_meta_data($this->stream);
+        $this->seekable = $meta['seekable'];
+        $this->readable = (bool)preg_match(self::READABLE_MODES, $meta['mode']);
+        $this->writable = (bool)preg_match(self::WRITABLE_MODES, $meta['mode']);
+        $this->uri = $this->getMetadata('uri');
+    }
+
+    /**
+     * Closes the stream when the destructed
+     */
+    public function __destruct()
+    {
+        $this->close();
+    }
+
+    public function __toString()
+    {
+        try {
+            if ($this->isSeekable()) {
+                $this->seek(0);
+            }
+            return $this->getContents();
+        } catch (\Exception $e) {
+            return '';
+        }
+    }
+
+    public function getContents()
+    {
+        if (!isset($this->stream)) {
+            throw new \RuntimeException('Stream is detached');
+        }
+
+        $contents = stream_get_contents($this->stream);
+
+        if ($contents === false) {
+            throw new \RuntimeException('Unable to read stream contents');
+        }
+
+        return $contents;
+    }
+
+    public function close()
+    {
+        if (isset($this->stream)) {
+            if (is_resource($this->stream)) {
+                fclose($this->stream);
+            }
+            $this->detach();
+        }
+    }
+
+    public function detach()
+    {
+        if (!isset($this->stream)) {
+            return null;
+        }
+
+        $result = $this->stream;
+        unset($this->stream);
+        $this->size = $this->uri = null;
+        $this->readable = $this->writable = $this->seekable = false;
+
+        return $result;
+    }
+
+    public function getSize()
+    {
+        if ($this->size !== null) {
+            return $this->size;
+        }
+
+        if (!isset($this->stream)) {
+            return null;
+        }
+
+        // Clear the stat cache if the stream has a URI
+        if ($this->uri) {
+            clearstatcache(true, $this->uri);
+        }
+
+        $stats = fstat($this->stream);
+        if (isset($stats['size'])) {
+            $this->size = $stats['size'];
+            return $this->size;
+        }
+
+        return null;
+    }
+
+    public function isReadable()
+    {
+        return $this->readable;
+    }
+
+    public function isWritable()
+    {
+        return $this->writable;
+    }
+
+    public function isSeekable()
+    {
+        return $this->seekable;
+    }
+
+    public function eof()
+    {
+        if (!isset($this->stream)) {
+            throw new \RuntimeException('Stream is detached');
+        }
+
+        return feof($this->stream);
+    }
+
+    public function tell()
+    {
+        if (!isset($this->stream)) {
+            throw new \RuntimeException('Stream is detached');
+        }
+
+        $result = ftell($this->stream);
+
+        if ($result === false) {
+            throw new \RuntimeException('Unable to determine stream position');
+        }
+
+        return $result;
+    }
+
+    public function rewind()
+    {
+        $this->seek(0);
+    }
+
+    public function seek($offset, $whence = SEEK_SET)
+    {
+        $whence = (int) $whence;
+
+        if (!isset($this->stream)) {
+            throw new \RuntimeException('Stream is detached');
+        }
+        if (!$this->seekable) {
+            throw new \RuntimeException('Stream is not seekable');
+        }
+        if (fseek($this->stream, $offset, $whence) === -1) {
+            throw new \RuntimeException('Unable to seek to stream position '
+                . $offset . ' with whence ' . var_export($whence, true));
+        }
+    }
+
+    public function read($length)
+    {
+        if (!isset($this->stream)) {
+            throw new \RuntimeException('Stream is detached');
+        }
+        if (!$this->readable) {
+            throw new \RuntimeException('Cannot read from non-readable stream');
+        }
+        if ($length < 0) {
+            throw new \RuntimeException('Length parameter cannot be negative');
+        }
+
+        if (0 === $length) {
+            return '';
+        }
+
+        $string = fread($this->stream, $length);
+        if (false === $string) {
+            throw new \RuntimeException('Unable to read from stream');
+        }
+
+        return $string;
+    }
+
+    public function write($string)
+    {
+        if (!isset($this->stream)) {
+            throw new \RuntimeException('Stream is detached');
+        }
+        if (!$this->writable) {
+            throw new \RuntimeException('Cannot write to a non-writable stream');
+        }
+
+        // We can't know the size after writing anything
+        $this->size = null;
+        $result = fwrite($this->stream, $string);
+
+        if ($result === false) {
+            throw new \RuntimeException('Unable to write to stream');
+        }
+
+        return $result;
+    }
+
+    public function getMetadata($key = null)
+    {
+        if (!isset($this->stream)) {
+            return $key ? null : [];
+        } elseif (!$key) {
+            return $this->customMetadata + stream_get_meta_data($this->stream);
+        } elseif (isset($this->customMetadata[$key])) {
+            return $this->customMetadata[$key];
+        }
+
+        $meta = stream_get_meta_data($this->stream);
+
+        return isset($meta[$key]) ? $meta[$key] : null;
+    }
+}
--- a/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/StreamDecoratorTrait.php
+++ b/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/StreamDecoratorTrait.php
@@ -0,0 +1,151 @@
+<?php
+
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * Stream decorator trait
+ * @property StreamInterface stream
+ */
+trait StreamDecoratorTrait
+{
+    /**
+     * @param StreamInterface $stream Stream to decorate
+     */
+    public function __construct(StreamInterface $stream)
+    {
+        $this->stream = $stream;
+    }
+
+    /**
+     * Magic method used to create a new stream if streams are not added in
+     * the constructor of a decorator (e.g., LazyOpenStream).
+     *
+     * @param string $name Name of the property (allows "stream" only).
+     *
+     * @return StreamInterface
+     */
+    public function __get($name)
+    {
+        if ($name == 'stream') {
+            $this->stream = $this->createStream();
+            return $this->stream;
+        }
+
+        throw new \UnexpectedValueException("$name not found on class");
+    }
+
+    public function __toString()
+    {
+        try {
+            if ($this->isSeekable()) {
+                $this->seek(0);
+            }
+            return $this->getContents();
+        } catch (\Exception $e) {
+            // Really, PHP? https://bugs.php.net/bug.php?id=53648
+            trigger_error('StreamDecorator::__toString exception: '
+                . (string) $e, E_USER_ERROR);
+            return '';
+        }
+    }
+
+    public function getContents()
+    {
+        return Utils::copyToString($this);
+    }
+
+    /**
+     * Allow decorators to implement custom methods
+     *
+     * @param string $method Missing method name
+     * @param array  $args   Method arguments
+     *
+     * @return mixed
+     */
+    public function __call($method, array $args)
+    {
+        $result = call_user_func_array([$this->stream, $method], $args);
+
+        // Always return the wrapped object if the result is a return $this
+        return $result === $this->stream ? $this : $result;
+    }
+
+    public function close()
+    {
+        $this->stream->close();
+    }
+
+    public function getMetadata($key = null)
+    {
+        return $this->stream->getMetadata($key);
+    }
+
+    public function detach()
+    {
+        return $this->stream->detach();
+    }
+
+    public function getSize()
+    {
+        return $this->stream->getSize();
+    }
+
+    public function eof()
+    {
+        return $this->stream->eof();
+    }
+
+    public function tell()
+    {
+        return $this->stream->tell();
+    }
+
+    public function isReadable()
+    {
+        return $this->stream->isReadable();
+    }
+
+    public function isWritable()
+    {
+        return $this->stream->isWritable();
+    }
+
+    public function isSeekable()
+    {
+        return $this->stream->isSeekable();
+    }
+
+    public function rewind()
+    {
+        $this->seek(0);
+    }
+
+    public function seek($offset, $whence = SEEK_SET)
+    {
+        $this->stream->seek($offset, $whence);
+    }
+
+    public function read($length)
+    {
+        return $this->stream->read($length);
+    }
+
+    public function write($string)
+    {
+        return $this->stream->write($string);
+    }
+
+    /**
+     * Implement in subclasses to dynamically create streams when requested.
+     *
+     * @return StreamInterface
+     *
+     * @throws \BadMethodCallException
+     */
+    protected function createStream()
+    {
+        throw new \BadMethodCallException('Not implemented');
+    }
+}
--- a/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/StreamWrapper.php
+++ b/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/StreamWrapper.php
@@ -0,0 +1,163 @@
+<?php
+
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * Converts Guzzle streams into PHP stream resources.
+ */
+class StreamWrapper
+{
+    /** @var resource */
+    public $context;
+
+    /** @var StreamInterface */
+    private $stream;
+
+    /** @var string r, r+, or w */
+    private $mode;
+
+    /**
+     * Returns a resource representing the stream.
+     *
+     * @param StreamInterface $stream The stream to get a resource for
+     *
+     * @return resource
+     *
+     * @throws \InvalidArgumentException if stream is not readable or writable
+     */
+    public static function getResource(StreamInterface $stream)
+    {
+        self::register();
+
+        if ($stream->isReadable()) {
+            $mode = $stream->isWritable() ? 'r+' : 'r';
+        } elseif ($stream->isWritable()) {
+            $mode = 'w';
+        } else {
+            throw new \InvalidArgumentException('The stream must be readable, '
+                . 'writable, or both.');
+        }
+
+        return fopen('guzzle://stream', $mode, null, self::createStreamContext($stream));
+    }
+
+    /**
+     * Creates a stream context that can be used to open a stream as a php stream resource.
+     *
+     * @param StreamInterface $stream
+     *
+     * @return resource
+     */
+    public static function createStreamContext(StreamInterface $stream)
+    {
+        return stream_context_create([
+            'guzzle' => ['stream' => $stream]
+        ]);
+    }
+
+    /**
+     * Registers the stream wrapper if needed
+     */
+    public static function register()
+    {
+        if (!in_array('guzzle', stream_get_wrappers())) {
+            stream_wrapper_register('guzzle', __CLASS__);
+        }
+    }
+
+    public function stream_open($path, $mode, $options, &$opened_path)
+    {
+        $options = stream_context_get_options($this->context);
+
+        if (!isset($options['guzzle']['stream'])) {
+            return false;
+        }
+
+        $this->mode = $mode;
+        $this->stream = $options['guzzle']['stream'];
+
+        return true;
+    }
+
+    public function stream_read($count)
+    {
+        return $this->stream->read($count);
+    }
+
+    public function stream_write($data)
+    {
+        return (int) $this->stream->write($data);
+    }
+
+    public function stream_tell()
+    {
+        return $this->stream->tell();
+    }
+
+    public function stream_eof()
+    {
+        return $this->stream->eof();
+    }
+
+    public function stream_seek($offset, $whence)
+    {
+        $this->stream->seek($offset, $whence);
+
+        return true;
+    }
+
+    public function stream_cast($cast_as)
+    {
+        $stream = clone($this->stream);
+
+        return $stream->detach();
+    }
+
+    public function stream_stat()
+    {
+        static $modeMap = [
+            'r'  => 33060,
+            'rb' => 33060,
+            'r+' => 33206,
+            'w'  => 33188,
+            'wb' => 33188
+        ];
+
+        return [
+            'dev'     => 0,
+            'ino'     => 0,
+            'mode'    => $modeMap[$this->mode],
+            'nlink'   => 0,
+            'uid'     => 0,
+            'gid'     => 0,
+            'rdev'    => 0,
+            'size'    => $this->stream->getSize() ?: 0,
+            'atime'   => 0,
+            'mtime'   => 0,
+            'ctime'   => 0,
+            'blksize' => 0,
+            'blocks'  => 0
+        ];
+    }
+
+    public function url_stat($path, $flags)
+    {
+        return [
+            'dev'     => 0,
+            'ino'     => 0,
+            'mode'    => 0,
+            'nlink'   => 0,
+            'uid'     => 0,
+            'gid'     => 0,
+            'rdev'    => 0,
+            'size'    => 0,
+            'atime'   => 0,
+            'mtime'   => 0,
+            'ctime'   => 0,
+            'blksize' => 0,
+            'blocks'  => 0
+        ];
+    }
+}
--- a/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/UploadedFile.php
+++ b/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/UploadedFile.php
@@ -0,0 +1,325 @@
+<?php
+
+namespace GuzzleHttp\Psr7;
+
+use InvalidArgumentException;
+use Psr\Http\Message\StreamInterface;
+use Psr\Http\Message\UploadedFileInterface;
+use RuntimeException;
+
+class UploadedFile implements UploadedFileInterface
+{
+    /**
+     * @var int[]
+     */
+    private static $errors = [
+        UPLOAD_ERR_OK,
+        UPLOAD_ERR_INI_SIZE,
+        UPLOAD_ERR_FORM_SIZE,
+        UPLOAD_ERR_PARTIAL,
+        UPLOAD_ERR_NO_FILE,
+        UPLOAD_ERR_NO_TMP_DIR,
+        UPLOAD_ERR_CANT_WRITE,
+        UPLOAD_ERR_EXTENSION,
+    ];
+
+    /**
+     * @var string
+     */
+    private $clientFilename;
+
+    /**
+     * @var string
+     */
+    private $clientMediaType;
+
+    /**
+     * @var int
+     */
+    private $error;
+
+    /**
+     * @var null|string
+     */
+    private $file;
+
+    /**
+     * @var bool
+     */
+    private $moved = false;
+
+    /**
+     * @var int
+     */
+    private $size;
+
+    /**
+     * @var StreamInterface|null
+     */
+    private $stream;
+
+    /**
+     * @param StreamInterface|string|resource $streamOrFile
+     * @param int $size
+     * @param int $errorStatus
+     * @param string|null $clientFilename
+     * @param string|null $clientMediaType
+     */
+    public function __construct(
+        $streamOrFile,
+        $size,
+        $errorStatus,
+        $clientFilename = null,
+        $clientMediaType = null
+    ) {
+        $this->setError($errorStatus);
+        $this->setSize($size);
+        $this->setClientFilename($clientFilename);
+        $this->setClientMediaType($clientMediaType);
+
+        if ($this->isOk()) {
+            $this->setStreamOrFile($streamOrFile);
+        }
+    }
+
+    /**
+     * Depending on the value set file or stream variable
+     *
+     * @param mixed $streamOrFile
+     *
+     * @throws InvalidArgumentException
+     */
+    private function setStreamOrFile($streamOrFile)
+    {
+        if (is_string($streamOrFile)) {
+            $this->file = $streamOrFile;
+        } elseif (is_resource($streamOrFile)) {
+            $this->stream = new Stream($streamOrFile);
+        } elseif ($streamOrFile instanceof StreamInterface) {
+            $this->stream = $streamOrFile;
+        } else {
+            throw new InvalidArgumentException(
+                'Invalid stream or file provided for UploadedFile'
+            );
+        }
+    }
+
+    /**
+     * @param int $error
+     *
+     * @throws InvalidArgumentException
+     */
+    private function setError($error)
+    {
+        if (false === is_int($error)) {
+            throw new InvalidArgumentException(
+                'Upload file error status must be an integer'
+            );
+        }
+
+        if (false === in_array($error, UploadedFile::$errors)) {
+            throw new InvalidArgumentException(
+                'Invalid error status for UploadedFile'
+            );
+        }
+
+        $this->error = $error;
+    }
+
+    /**
+     * @param int $size
+     *
+     * @throws InvalidArgumentException
+     */
+    private function setSize($size)
+    {
+        if (false === is_int($size)) {
+            throw new InvalidArgumentException(
+                'Upload file size must be an integer'
+            );
+        }
+
+        $this->size = $size;
+    }
+
+    /**
+     * @param mixed $param
+     * @return boolean
+     */
+    private function isStringOrNull($param)
+    {
+        return in_array(gettype($param), ['string', 'NULL']);
+    }
+
+    /**
+     * @param mixed $param
+     * @return boolean
+     */
+    private function isStringNotEmpty($param)
+    {
+        return is_string($param) && false === empty($param);
+    }
+
+    /**
+     * @param string|null $clientFilename
+     *
+     * @throws InvalidArgumentException
+     */
+    private function setClientFilename($clientFilename)
+    {
+        if (false === $this->isStringOrNull($clientFilename)) {
+            throw new InvalidArgumentException(
+                'Upload file client filename must be a string or null'
+            );
+        }
+
+        $this->clientFilename = $clientFilename;
+    }
+
+    /**
+     * @param string|null $clientMediaType
+     *
+     * @throws InvalidArgumentException
+     */
+    private function setClientMediaType($clientMediaType)
+    {
+        if (false === $this->isStringOrNull($clientMediaType)) {
+            throw new InvalidArgumentException(
+                'Upload file client media type must be a string or null'
+            );
+        }
+
+        $this->clientMediaType = $clientMediaType;
+    }
+
+    /**
+     * Return true if there is no upload error
+     *
+     * @return boolean
+     */
+    private function isOk()
+    {
+        return $this->error === UPLOAD_ERR_OK;
+    }
+
+    /**
+     * @return boolean
+     */
+    public function isMoved()
+    {
+        return $this->moved;
+    }
+
+    /**
+     * @throws RuntimeException if is moved or not ok
+     */
+    private function validateActive()
+    {
+        if (false === $this->isOk()) {
+            throw new RuntimeException('Cannot retrieve stream due to upload error');
+        }
+
+        if ($this->isMoved()) {
+            throw new RuntimeException('Cannot retrieve stream after it has already been moved');
+        }
+    }
+
+    /**
+     * {@inheritdoc}
+     *
+     * @throws RuntimeException if the upload was not successful.
+     */
+    public function getStream()
+    {
+        $this->validateActive();
+
+        if ($this->stream instanceof StreamInterface) {
+            return $this->stream;
+        }
+
+        return new LazyOpenStream($this->file, 'r+');
+    }
+
+    /**
+     * {@inheritdoc}
+     *
+     * @see http://php.net/is_uploaded_file
+     * @see http://php.net/move_uploaded_file
+     *
+     * @param string $targetPath Path to which to move the uploaded file.
+     *
+     * @throws RuntimeException if the upload was not successful.
+     * @throws InvalidArgumentException if the $path specified is invalid.
+     * @throws RuntimeException on any error during the move operation, or on
+     *     the second or subsequent call to the method.
+     */
+    public function moveTo($targetPath)
+    {
+        $this->validateActive();
+
+        if (false === $this->isStringNotEmpty($targetPath)) {
+            throw new InvalidArgumentException(
+                'Invalid path provided for move operation; must be a non-empty string'
+            );
+        }
+
+        if ($this->file) {
+            $this->moved = php_sapi_name() == 'cli'
+                ? rename($this->file, $targetPath)
+                : move_uploaded_file($this->file, $targetPath);
+        } else {
+            Utils::copyToStream(
+                $this->getStream(),
+                new LazyOpenStream($targetPath, 'w')
+            );
+
+            $this->moved = true;
+        }
+
+        if (false === $this->moved) {
+            throw new RuntimeException(
+                sprintf('Uploaded file could not be moved to %s', $targetPath)
+            );
+        }
+    }
+
+    /**
+     * {@inheritdoc}
+     *
+     * @return int|null The file size in bytes or null if unknown.
+     */
+    public function getSize()
+    {
+        return $this->size;
+    }
+
+    /**
+     * {@inheritdoc}
+     *
+     * @see http://php.net/manual/en/features.file-upload.errors.php
+     * @return int One of PHP's UPLOAD_ERR_XXX constants.
+     */
+    public function getError()
+    {
+        return $this->error;
+    }
+
+    /**
+     * {@inheritdoc}
+     *
+     * @return string|null The filename sent by the client or null if none
+     *     was provided.
+     */
+    public function getClientFilename()
+    {
+        return $this->clientFilename;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getClientMediaType()
+    {
+        return $this->clientMediaType;
+    }
+}
--- a/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/Uri.php
+++ b/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/Uri.php
@@ -0,0 +1,761 @@
+<?php
+
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\UriInterface;
+
+/**
+ * PSR-7 URI implementation.
+ *
+ * @author Michael Dowling
+ * @author Tobias Schultze
+ * @author Matthew Weier O'Phinney
+ */
+class Uri implements UriInterface
+{
+    /**
+     * Absolute http and https URIs require a host per RFC 7230 Section 2.7
+     * but in generic URIs the host can be empty. So for http(s) URIs
+     * we apply this default host when no host is given yet to form a
+     * valid URI.
+     */
+    const HTTP_DEFAULT_HOST = 'localhost';
+
+    private static $defaultPorts = [
+        'http'  => 80,
+        'https' => 443,
+        'ftp' => 21,
+        'gopher' => 70,
+        'nntp' => 119,
+        'news' => 119,
+        'telnet' => 23,
+        'tn3270' => 23,
+        'imap' => 143,
+        'pop' => 110,
+        'ldap' => 389,
+    ];
+
+    private static $charUnreserved = 'a-zA-Z0-9_\-\.~';
+    private static $charSubDelims = '!\$&\'\(\)\*\+,;=';
+    private static $replaceQuery = ['=' => '%3D', '&' => '%26'];
+
+    /** @var string Uri scheme. */
+    private $scheme = '';
+
+    /** @var string Uri user info. */
+    private $userInfo = '';
+
+    /** @var string Uri host. */
+    private $host = '';
+
+    /** @var int|null Uri port. */
+    private $port;
+
+    /** @var string Uri path. */
+    private $path = '';
+
+    /** @var string Uri query string. */
+    private $query = '';
+
+    /** @var string Uri fragment. */
+    private $fragment = '';
+
+    /**
+     * @param string $uri URI to parse
+     */
+    public function __construct($uri = '')
+    {
+        // weak type check to also accept null until we can add scalar type hints
+        if ($uri != '') {
+            $parts = parse_url($uri);
+            if ($parts === false) {
+                throw new \InvalidArgumentException("Unable to parse URI: $uri");
+            }
+            $this->applyParts($parts);
+        }
+    }
+
+    public function __toString()
+    {
+        return self::composeComponents(
+            $this->scheme,
+            $this->getAuthority(),
+            $this->path,
+            $this->query,
+            $this->fragment
+        );
+    }
+
+    /**
+     * Composes a URI reference string from its various components.
+     *
+     * Usually this method does not need to be called manually but instead is used indirectly via
+     * `Psr\Http\Message\UriInterface::__toString`.
+     *
+     * PSR-7 UriInterface treats an empty component the same as a missing component as
+     * getQuery(), getFragment() etc. always return a string. This explains the slight
+     * difference to RFC 3986 Section 5.3.
+     *
+     * Another adjustment is that the authority separator is added even when the authority is missing/empty
+     * for the "file" scheme. This is because PHP stream functions like `file_get_contents` only work with
+     * `file:///myfile` but not with `file:/myfile` although they are equivalent according to RFC 3986. But
+     * `file:///` is the more common syntax for the file scheme anyway (Chrome for example redirects to
+     * that format).
+     *
+     * @param string $scheme
+     * @param string $authority
+     * @param string $path
+     * @param string $query
+     * @param string $fragment
+     *
+     * @return string
+     *
+     * @link https://tools.ietf.org/html/rfc3986#section-5.3
+     */
+    public static function composeComponents($scheme, $authority, $path, $query, $fragment)
+    {
+        $uri = '';
+
+        // weak type checks to also accept null until we can add scalar type hints
+        if ($scheme != '') {
+            $uri .= $scheme . ':';
+        }
+
+        if ($authority != ''|| $scheme === 'file') {
+            $uri .= '//' . $authority;
+        }
+
+        $uri .= $path;
+
+        if ($query != '') {
+            $uri .= '?' . $query;
+        }
+
+        if ($fragment != '') {
+            $uri .= '#' . $fragment;
+        }
+
+        return $uri;
+    }
+
+    /**
+     * Whether the URI has the default port of the current scheme.
+     *
+     * `Psr\Http\Message\UriInterface::getPort` may return null or the standard port. This method can be used
+     * independently of the implementation.
+     *
+     * @param UriInterface $uri
+     *
+     * @return bool
+     */
+    public static function isDefaultPort(UriInterface $uri)
+    {
+        return $uri->getPort() === null
+            || (isset(self::$defaultPorts[$uri->getScheme()]) && $uri->getPort() === self::$defaultPorts[$uri->getScheme()]);
+    }
+
+    /**
+     * Whether the URI is absolute, i.e. it has a scheme.
+     *
+     * An instance of UriInterface can either be an absolute URI or a relative reference. This method returns true
+     * if it is the former. An absolute URI has a scheme. A relative reference is used to express a URI relative
+     * to another URI, the base URI. Relative references can be divided into several forms:
+     * - network-path references, e.g. '//example.com/path'
+     * - absolute-path references, e.g. '/path'
+     * - relative-path references, e.g. 'subpath'
+     *
+     * @param UriInterface $uri
+     *
+     * @return bool
+     * @see Uri::isNetworkPathReference
+     * @see Uri::isAbsolutePathReference
+     * @see Uri::isRelativePathReference
+     * @link https://tools.ietf.org/html/rfc3986#section-4
+     */
+    public static function isAbsolute(UriInterface $uri)
+    {
+        return $uri->getScheme() !== '';
+    }
+
+    /**
+     * Whether the URI is a network-path reference.
+     *
+     * A relative reference that begins with two slash characters is termed an network-path reference.
+     *
+     * @param UriInterface $uri
+     *
+     * @return bool
+     * @link https://tools.ietf.org/html/rfc3986#section-4.2
+     */
+    public static function isNetworkPathReference(UriInterface $uri)
+    {
+        return $uri->getScheme() === '' && $uri->getAuthority() !== '';
+    }
+
+    /**
+     * Whether the URI is a absolute-path reference.
+     *
+     * A relative reference that begins with a single slash character is termed an absolute-path reference.
+     *
+     * @param UriInterface $uri
+     *
+     * @return bool
+     * @link https://tools.ietf.org/html/rfc3986#section-4.2
+     */
+    public static function isAbsolutePathReference(UriInterface $uri)
+    {
+        return $uri->getScheme() === ''
+            && $uri->getAuthority() === ''
+            && isset($uri->getPath()[0])
+            && $uri->getPath()[0] === '/';
+    }
+
+    /**
+     * Whether the URI is a relative-path reference.
+     *
+     * A relative reference that does not begin with a slash character is termed a relative-path reference.
+     *
+     * @param UriInterface $uri
+     *
+     * @return bool
+     * @link https://tools.ietf.org/html/rfc3986#section-4.2
+     */
+    public static function isRelativePathReference(UriInterface $uri)
+    {
+        return $uri->getScheme() === ''
+            && $uri->getAuthority() === ''
+            && (!isset($uri->getPath()[0]) || $uri->getPath()[0] !== '/');
+    }
+
+    /**
+     * Whether the URI is a same-document reference.
+     *
+     * A same-document reference refers to a URI that is, aside from its fragment
+     * component, identical to the base URI. When no base URI is given, only an empty
+     * URI reference (apart from its fragment) is considered a same-document reference.
+     *
+     * @param UriInterface      $uri  The URI to check
+     * @param UriInterface|null $base An optional base URI to compare against
+     *
+     * @return bool
+     * @link https://tools.ietf.org/html/rfc3986#section-4.4
+     */
+    public static function isSameDocumentReference(UriInterface $uri, UriInterface $base = null)
+    {
+        if ($base !== null) {
+            $uri = UriResolver::resolve($base, $uri);
+
+            return ($uri->getScheme() === $base->getScheme())
+                && ($uri->getAuthority() === $base->getAuthority())
+                && ($uri->getPath() === $base->getPath())
+                && ($uri->getQuery() === $base->getQuery());
+        }
+
+        return $uri->getScheme() === '' && $uri->getAuthority() === '' && $uri->getPath() === '' && $uri->getQuery() === '';
+    }
+
+    /**
+     * Removes dot segments from a path and returns the new path.
+     *
+     * @param string $path
+     *
+     * @return string
+     *
+     * @deprecated since version 1.4. Use UriResolver::removeDotSegments instead.
+     * @see UriResolver::removeDotSegments
+     */
+    public static function removeDotSegments($path)
+    {
+        return UriResolver::removeDotSegments($path);
+    }
+
+    /**
+     * Converts the relative URI into a new URI that is resolved against the base URI.
+     *
+     * @param UriInterface        $base Base URI
+     * @param string|UriInterface $rel  Relative URI
+     *
+     * @return UriInterface
+     *
+     * @deprecated since version 1.4. Use UriResolver::resolve instead.
+     * @see UriResolver::resolve
+     */
+    public static function resolve(UriInterface $base, $rel)
+    {
+        if (!($rel instanceof UriInterface)) {
+            $rel = new self($rel);
+        }
+
+        return UriResolver::resolve($base, $rel);
+    }
+
+    /**
+     * Creates a new URI with a specific query string value removed.
+     *
+     * Any existing query string values that exactly match the provided key are
+     * removed.
+     *
+     * @param UriInterface $uri URI to use as a base.
+     * @param string       $key Query string key to remove.
+     *
+     * @return UriInterface
+     */
+    public static function withoutQueryValue(UriInterface $uri, $key)
+    {
+        $result = self::getFilteredQueryString($uri, [$key]);
+
+        return $uri->withQuery(implode('&', $result));
+    }
+
+    /**
+     * Creates a new URI with a specific query string value.
+     *
+     * Any existing query string values that exactly match the provided key are
+     * removed and replaced with the given key value pair.
+     *
+     * A value of null will set the query string key without a value, e.g. "key"
+     * instead of "key=value".
+     *
+     * @param UriInterface $uri   URI to use as a base.
+     * @param string       $key   Key to set.
+     * @param string|null  $value Value to set
+     *
+     * @return UriInterface
+     */
+    public static function withQueryValue(UriInterface $uri, $key, $value)
+    {
+        $result = self::getFilteredQueryString($uri, [$key]);
+
+        $result[] = self::generateQueryString($key, $value);
+
+        return $uri->withQuery(implode('&', $result));
+    }
+
+    /**
+     * Creates a new URI with multiple specific query string values.
+     *
+     * It has the same behavior as withQueryValue() but for an associative array of key => value.
+     *
+     * @param UriInterface $uri           URI to use as a base.
+     * @param array        $keyValueArray Associative array of key and values
+     *
+     * @return UriInterface
+     */
+    public static function withQueryValues(UriInterface $uri, array $keyValueArray)
+    {
+        $result = self::getFilteredQueryString($uri, array_keys($keyValueArray));
+
+        foreach ($keyValueArray as $key => $value) {
+            $result[] = self::generateQueryString($key, $value);
+        }
+
+        return $uri->withQuery(implode('&', $result));
+    }
+
+    /**
+     * Creates a URI from a hash of `parse_url` components.
+     *
+     * @param array $parts
+     *
+     * @return UriInterface
+     * @link http://php.net/manual/en/function.parse-url.php
+     *
+     * @throws \InvalidArgumentException If the components do not form a valid URI.
+     */
+    public static function fromParts(array $parts)
+    {
+        $uri = new self();
+        $uri->applyParts($parts);
+        $uri->validateState();
+
+        return $uri;
+    }
+
+    public function getScheme()
+    {
+        return $this->scheme;
+    }
+
+    public function getAuthority()
+    {
+        $authority = $this->host;
+        if ($this->userInfo !== '') {
+            $authority = $this->userInfo . '@' . $authority;
+        }
+
+        if ($this->port !== null) {
+            $authority .= ':' . $this->port;
+        }
+
+        return $authority;
+    }
+
+    public function getUserInfo()
+    {
+        return $this->userInfo;
+    }
+
+    public function getHost()
+    {
+        return $this->host;
+    }
+
+    public function getPort()
+    {
+        return $this->port;
+    }
+
+    public function getPath()
+    {
+        return $this->path;
+    }
+
+    public function getQuery()
+    {
+        return $this->query;
+    }
+
+    public function getFragment()
+    {
+        return $this->fragment;
+    }
+
+    public function withScheme($scheme)
+    {
+        $scheme = $this->filterScheme($scheme);
+
+        if ($this->scheme === $scheme) {
+            return $this;
+        }
+
+        $new = clone $this;
+        $new->scheme = $scheme;
+        $new->removeDefaultPort();
+        $new->validateState();
+
+        return $new;
+    }
+
+    public function withUserInfo($user, $password = null)
+    {
+        $info = $this->filterUserInfoComponent($user);
+        if ($password !== null) {
+            $info .= ':' . $this->filterUserInfoComponent($password);
+        }
+
+        if ($this->userInfo === $info) {
+            return $this;
+        }
+
+        $new = clone $this;
+        $new->userInfo = $info;
+        $new->validateState();
+
+        return $new;
+    }
+
+    public function withHost($host)
+    {
+        $host = $this->filterHost($host);
+
+        if ($this->host === $host) {
+            return $this;
+        }
+
+        $new = clone $this;
+        $new->host = $host;
+        $new->validateState();
+
+        return $new;
+    }
+
+    public function withPort($port)
+    {
+        $port = $this->filterPort($port);
+
+        if ($this->port === $port) {
+            return $this;
+        }
+
+        $new = clone $this;
+        $new->port = $port;
+        $new->removeDefaultPort();
+        $new->validateState();
+
+        return $new;
+    }
+
+    public function withPath($path)
+    {
+        $path = $this->filterPath($path);
+
+        if ($this->path === $path) {
+            return $this;
+        }
+
+        $new = clone $this;
+        $new->path = $path;
+        $new->validateState();
+
+        return $new;
+    }
+
+    public function withQuery($query)
+    {
+        $query = $this->filterQueryAndFragment($query);
+
+        if ($this->query === $query) {
+            return $this;
+        }
+
+        $new = clone $this;
+        $new->query = $query;
+
+        return $new;
+    }
+
+    public function withFragment($fragment)
+    {
+        $fragment = $this->filterQueryAndFragment($fragment);
+
+        if ($this->fragment === $fragment) {
+            return $this;
+        }
+
+        $new = clone $this;
+        $new->fragment = $fragment;
+
+        return $new;
+    }
+
+    /**
+     * Apply parse_url parts to a URI.
+     *
+     * @param array $parts Array of parse_url parts to apply.
+     */
+    private function applyParts(array $parts)
+    {
+        $this->scheme = isset($parts['scheme'])
+            ? $this->filterScheme($parts['scheme'])
+            : '';
+        $this->userInfo = isset($parts['user'])
+            ? $this->filterUserInfoComponent($parts['user'])
+            : '';
+        $this->host = isset($parts['host'])
+            ? $this->filterHost($parts['host'])
+            : '';
+        $this->port = isset($parts['port'])
+            ? $this->filterPort($parts['port'])
+            : null;
+        $this->path = isset($parts['path'])
+            ? $this->filterPath($parts['path'])
+            : '';
+        $this->query = isset($parts['query'])
+            ? $this->filterQueryAndFragment($parts['query'])
+            : '';
+        $this->fragment = isset($parts['fragment'])
+            ? $this->filterQueryAndFragment($parts['fragment'])
+            : '';
+        if (isset($parts['pass'])) {
+            $this->userInfo .= ':' . $this->filterUserInfoComponent($parts['pass']);
+        }
+
+        $this->removeDefaultPort();
+    }
+
+    /**
+     * @param string $scheme
+     *
+     * @return string
+     *
+     * @throws \InvalidArgumentException If the scheme is invalid.
+     */
+    private function filterScheme($scheme)
+    {
+        if (!is_string($scheme)) {
+            throw new \InvalidArgumentException('Scheme must be a string');
+        }
+
+        return strtolower($scheme);
+    }
+
+    /**
+     * @param string $component
+     *
+     * @return string
+     *
+     * @throws \InvalidArgumentException If the user info is invalid.
+     */
+    private function filterUserInfoComponent($component)
+    {
+        if (!is_string($component)) {
+            throw new \InvalidArgumentException('User info must be a string');
+        }
+
+        return preg_replace_callback(
+            '/(?:[^%' . self::$charUnreserved . self::$charSubDelims . ']+|%(?![A-Fa-f0-9]{2}))/',
+            [$this, 'rawurlencodeMatchZero'],
+            $component
+        );
+    }
+
+    /**
+     * @param string $host
+     *
+     * @return string
+     *
+     * @throws \InvalidArgumentException If the host is invalid.
+     */
+    private function filterHost($host)
+    {
+        if (!is_string($host)) {
+            throw new \InvalidArgumentException('Host must be a string');
+        }
+
+        return strtolower($host);
+    }
+
+    /**
+     * @param int|null $port
+     *
+     * @return int|null
+     *
+     * @throws \InvalidArgumentException If the port is invalid.
+     */
+    private function filterPort($port)
+    {
+        if ($port === null) {
+            return null;
+        }
+
+        $port = (int) $port;
+        if (0 > $port || 0xffff < $port) {
+            throw new \InvalidArgumentException(
+                sprintf('Invalid port: %d. Must be between 0 and 65535', $port)
+            );
+        }
+
+        return $port;
+    }
+
+    /**
+     * @param UriInterface $uri
+     * @param array        $keys
+     * 
+     * @return array
+     */
+    private static function getFilteredQueryString(UriInterface $uri, array $keys)
+    {
+        $current = $uri->getQuery();
+
+        if ($current === '') {
+            return [];
+        }
+
+        $decodedKeys = array_map('rawurldecode', $keys);
+
+        return array_filter(explode('&', $current), function ($part) use ($decodedKeys) {
+            return !in_array(rawurldecode(explode('=', $part)[0]), $decodedKeys, true);
+        });
+    }
+
+    /**
+     * @param string      $key
+     * @param string|null $value
+     * 
+     * @return string
+     */
+    private static function generateQueryString($key, $value)
+    {
+        // Query string separators ("=", "&") within the key or value need to be encoded
+        // (while preventing double-encoding) before setting the query string. All other
+        // chars that need percent-encoding will be encoded by withQuery().
+        $queryString = strtr($key, self::$replaceQuery);
+
+        if ($value !== null) {
+            $queryString .= '=' . strtr($value, self::$replaceQuery);
+        }
+
+        return $queryString;
+    }
+
+    private function removeDefaultPort()
+    {
+        if ($this->port !== null && self::isDefaultPort($this)) {
+            $this->port = null;
+        }
+    }
+
+    /**
+     * Filters the path of a URI
+     *
+     * @param string $path
+     *
+     * @return string
+     *
+     * @throws \InvalidArgumentException If the path is invalid.
+     */
+    private function filterPath($path)
+    {
+        if (!is_string($path)) {
+            throw new \InvalidArgumentException('Path must be a string');
+        }
+
+        return preg_replace_callback(
+            '/(?:[^' . self::$charUnreserved . self::$charSubDelims . '%:@\/]++|%(?![A-Fa-f0-9]{2}))/',
+            [$this, 'rawurlencodeMatchZero'],
+            $path
+        );
+    }
+
+    /**
+     * Filters the query string or fragment of a URI.
+     *
+     * @param string $str
+     *
+     * @return string
+     *
+     * @throws \InvalidArgumentException If the query or fragment is invalid.
+     */
+    private function filterQueryAndFragment($str)
+    {
+        if (!is_string($str)) {
+            throw new \InvalidArgumentException('Query and fragment must be a string');
+        }
+
+        return preg_replace_callback(
+            '/(?:[^' . self::$charUnreserved . self::$charSubDelims . '%:@\/\?]++|%(?![A-Fa-f0-9]{2}))/',
+            [$this, 'rawurlencodeMatchZero'],
+            $str
+        );
+    }
+
+    private function rawurlencodeMatchZero(array $match)
+    {
+        return rawurlencode($match[0]);
+    }
+
+    private function validateState()
+    {
+        if ($this->host === '' && ($this->scheme === 'http' || $this->scheme === 'https')) {
+            $this->host = self::HTTP_DEFAULT_HOST;
+        }
+
+        if ($this->getAuthority() === '') {
+            if (0 === strpos($this->path, '//')) {
+                throw new \InvalidArgumentException('The path of a URI without an authority must not start with two slashes "//"');
+            }
+            if ($this->scheme === '' && false !== strpos(explode('/', $this->path, 2)[0], ':')) {
+                throw new \InvalidArgumentException('A relative URI must not have a path beginning with a segment containing a colon');
+            }
+        } elseif (isset($this->path[0]) && $this->path[0] !== '/') {
+            @trigger_error(
+                'The path of a URI with an authority must start with a slash "/" or be empty. Automagically fixing the URI ' .
+                'by adding a leading slash to the path is deprecated since version 1.4 and will throw an exception instead.',
+                E_USER_DEPRECATED
+            );
+            $this->path = '/'. $this->path;
+            //throw new \InvalidArgumentException('The path of a URI with an authority must start with a slash "/" or be empty');
+        }
+    }
+}
--- a/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/UriNormalizer.php
+++ b/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/UriNormalizer.php
@@ -0,0 +1,217 @@
+<?php
+
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\UriInterface;
+
+/**
+ * Provides methods to normalize and compare URIs.
+ *
+ * @author Tobias Schultze
+ *
+ * @link https://tools.ietf.org/html/rfc3986#section-6
+ */
+final class UriNormalizer
+{
+    /**
+     * Default normalizations which only include the ones that preserve semantics.
+     *
+     * self::CAPITALIZE_PERCENT_ENCODING | self::DECODE_UNRESERVED_CHARACTERS | self::CONVERT_EMPTY_PATH |
+     * self::REMOVE_DEFAULT_HOST | self::REMOVE_DEFAULT_PORT | self::REMOVE_DOT_SEGMENTS
+     */
+    const PRESERVING_NORMALIZATIONS = 63;
+
+    /**
+     * All letters within a percent-encoding triplet (e.g., "%3A") are case-insensitive, and should be capitalized.
+     *
+     * Example: http://example.org/a%c2%b1b → http://example.org/a%C2%B1b
+     */
+    const CAPITALIZE_PERCENT_ENCODING = 1;
+
+    /**
+     * Decodes percent-encoded octets of unreserved characters.
+     *
+     * For consistency, percent-encoded octets in the ranges of ALPHA (%41–%5A and %61–%7A), DIGIT (%30–%39),
+     * hyphen (%2D), period (%2E), underscore (%5F), or tilde (%7E) should not be created by URI producers and,
+     * when found in a URI, should be decoded to their corresponding unreserved characters by URI normalizers.
+     *
+     * Example: http://example.org/%7Eusern%61me/ → http://example.org/~username/
+     */
+    const DECODE_UNRESERVED_CHARACTERS = 2;
+
+    /**
+     * Converts the empty path to "/" for http and https URIs.
+     *
+     * Example: http://example.org → http://example.org/
+     */
+    const CONVERT_EMPTY_PATH = 4;
+
+    /**
+     * Removes the default host of the given URI scheme from the URI.
+     *
+     * Only the "file" scheme defines the default host "localhost".
+     * All of `file:/myfile`, `file:///myfile`, and `file://localhost/myfile`
+     * are equivalent according to RFC 3986. The first format is not accepted
+     * by PHPs stream functions and thus already normalized implicitly to the
+     * second format in the Uri class. See `GuzzleHttp\Psr7\Uri::composeComponents`.
+     *
+     * Example: file://localhost/myfile → file:///myfile
+     */
+    const REMOVE_DEFAULT_HOST = 8;
+
+    /**
+     * Removes the default port of the given URI scheme from the URI.
+     *
+     * Example: http://example.org:80/ → http://example.org/
+     */
+    const REMOVE_DEFAULT_PORT = 16;
+
+    /**
+     * Removes unnecessary dot-segments.
+     *
+     * Dot-segments in relative-path references are not removed as it would
+     * change the semantics of the URI reference.
+     *
+     * Example: http://example.org/../a/b/../c/./d.html → http://example.org/a/c/d.html
+     */
+    const REMOVE_DOT_SEGMENTS = 32;
+
+    /**
+     * Paths which include two or more adjacent slashes are converted to one.
+     *
+     * Webservers usually ignore duplicate slashes and treat those URIs equivalent.
+     * But in theory those URIs do not need to be equivalent. So this normalization
+     * may change the semantics. Encoded slashes (%2F) are not removed.
+     *
+     * Example: http://example.org//foo///bar.html → http://example.org/foo/bar.html
+     */
+    const REMOVE_DUPLICATE_SLASHES = 64;
+
+    /**
+     * Sort query parameters with their values in alphabetical order.
+     *
+     * However, the order of parameters in a URI may be significant (this is not defined by the standard).
+     * So this normalization is not safe and may change the semantics of the URI.
+     *
+     * Example: ?lang=en&article=fred → ?article=fred&lang=en
+     *
+     * Note: The sorting is neither locale nor Unicode aware (the URI query does not get decoded at all) as the
+     * purpose is to be able to compare URIs in a reproducible way, not to have the params sorted perfectly.
+     */
+    const SORT_QUERY_PARAMETERS = 128;
+
+    /**
+     * Returns a normalized URI.
+     *
+     * The scheme and host component are already normalized to lowercase per PSR-7 UriInterface.
+     * This methods adds additional normalizations that can be configured with the $flags parameter.
+     *
+     * PSR-7 UriInterface cannot distinguish between an empty component and a missing component as
+     * getQuery(), getFragment() etc. always return a string. This means the URIs "/?#" and "/" are
+     * treated equivalent which is not necessarily true according to RFC 3986. But that difference
+     * is highly uncommon in reality. So this potential normalization is implied in PSR-7 as well.
+     *
+     * @param UriInterface $uri   The URI to normalize
+     * @param int          $flags A bitmask of normalizations to apply, see constants
+     *
+     * @return UriInterface The normalized URI
+     * @link https://tools.ietf.org/html/rfc3986#section-6.2
+     */
+    public static function normalize(UriInterface $uri, $flags = self::PRESERVING_NORMALIZATIONS)
+    {
+        if ($flags & self::CAPITALIZE_PERCENT_ENCODING) {
+            $uri = self::capitalizePercentEncoding($uri);
+        }
+
+        if ($flags & self::DECODE_UNRESERVED_CHARACTERS) {
+            $uri = self::decodeUnreservedCharacters($uri);
+        }
+
+        if ($flags & self::CONVERT_EMPTY_PATH && $uri->getPath() === '' &&
+            ($uri->getScheme() === 'http' || $uri->getScheme() === 'https')
+        ) {
+            $uri = $uri->withPath('/');
+        }
+
+        if ($flags & self::REMOVE_DEFAULT_HOST && $uri->getScheme() === 'file' && $uri->getHost() === 'localhost') {
+            $uri = $uri->withHost('');
+        }
+
+        if ($flags & self::REMOVE_DEFAULT_PORT && $uri->getPort() !== null && Uri::isDefaultPort($uri)) {
+            $uri = $uri->withPort(null);
+        }
+
+        if ($flags & self::REMOVE_DOT_SEGMENTS && !Uri::isRelativePathReference($uri)) {
+            $uri = $uri->withPath(UriResolver::removeDotSegments($uri->getPath()));
+        }
+
+        if ($flags & self::REMOVE_DUPLICATE_SLASHES) {
+            $uri = $uri->withPath(preg_replace('#//++#', '/', $uri->getPath()));
+        }
+
+        if ($flags & self::SORT_QUERY_PARAMETERS && $uri->getQuery() !== '') {
+            $queryKeyValues = explode('&', $uri->getQuery());
+            sort($queryKeyValues);
+            $uri = $uri->withQuery(implode('&', $queryKeyValues));
+        }
+
+        return $uri;
+    }
+
+    /**
+     * Whether two URIs can be considered equivalent.
+     *
+     * Both URIs are normalized automatically before comparison with the given $normalizations bitmask. The method also
+     * accepts relative URI references and returns true when they are equivalent. This of course assumes they will be
+     * resolved against the same base URI. If this is not the case, determination of equivalence or difference of
+     * relative references does not mean anything.
+     *
+     * @param UriInterface $uri1           An URI to compare
+     * @param UriInterface $uri2           An URI to compare
+     * @param int          $normalizations A bitmask of normalizations to apply, see constants
+     *
+     * @return bool
+     * @link https://tools.ietf.org/html/rfc3986#section-6.1
+     */
+    public static function isEquivalent(UriInterface $uri1, UriInterface $uri2, $normalizations = self::PRESERVING_NORMALIZATIONS)
+    {
+        return (string) self::normalize($uri1, $normalizations) === (string) self::normalize($uri2, $normalizations);
+    }
+
+    private static function capitalizePercentEncoding(UriInterface $uri)
+    {
+        $regex = '/(?:%[A-Fa-f0-9]{2})++/';
+
+        $callback = function (array $match) {
+            return strtoupper($match[0]);
+        };
+
+        return
+            $uri->withPath(
+                preg_replace_callback($regex, $callback, $uri->getPath())
+            )->withQuery(
+                preg_replace_callback($regex, $callback, $uri->getQuery())
+            );
+    }
+
+    private static function decodeUnreservedCharacters(UriInterface $uri)
+    {
+        $regex = '/%(?:2D|2E|5F|7E|3[0-9]|[46][1-9A-F]|[57][0-9A])/i';
+
+        $callback = function (array $match) {
+            return rawurldecode($match[0]);
+        };
+
+        return
+            $uri->withPath(
+                preg_replace_callback($regex, $callback, $uri->getPath())
+            )->withQuery(
+                preg_replace_callback($regex, $callback, $uri->getQuery())
+            );
+    }
+
+    private function __construct()
+    {
+        // cannot be instantiated
+    }
+}
--- a/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/UriResolver.php
+++ b/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/UriResolver.php
@@ -0,0 +1,220 @@
+<?php
+
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\UriInterface;
+
+/**
+ * Resolves a URI reference in the context of a base URI and the opposite way.
+ *
+ * @author Tobias Schultze
+ *
+ * @link https://tools.ietf.org/html/rfc3986#section-5
+ */
+final class UriResolver
+{
+    /**
+     * Removes dot segments from a path and returns the new path.
+     *
+     * @param string $path
+     *
+     * @return string
+     * @link http://tools.ietf.org/html/rfc3986#section-5.2.4
+     */
+    public static function removeDotSegments($path)
+    {
+        if ($path === '' || $path === '/') {
+            return $path;
+        }
+
+        $results = [];
+        $segments = explode('/', $path);
+        foreach ($segments as $segment) {
+            if ($segment === '..') {
+                array_pop($results);
+            } elseif ($segment !== '.') {
+                $results[] = $segment;
+            }
+        }
+
+        $newPath = implode('/', $results);
+
+        if ($path[0] === '/' && (!isset($newPath[0]) || $newPath[0] !== '/')) {
+            // Re-add the leading slash if necessary for cases like "/.."
+            $newPath = '/' . $newPath;
+        } elseif ($newPath !== '' && ($segment === '.' || $segment === '..')) {
+            // Add the trailing slash if necessary
+            // If newPath is not empty, then $segment must be set and is the last segment from the foreach
+            $newPath .= '/';
+        }
+
+        return $newPath;
+    }
+
+    /**
+     * Converts the relative URI into a new URI that is resolved against the base URI.
+     *
+     * @param UriInterface $base Base URI
+     * @param UriInterface $rel  Relative URI
+     *
+     * @return UriInterface
+     * @link http://tools.ietf.org/html/rfc3986#section-5.2
+     */
+    public static function resolve(UriInterface $base, UriInterface $rel)
+    {
+        if ((string) $rel === '') {
+            // we can simply return the same base URI instance for this same-document reference
+            return $base;
+        }
+
+        if ($rel->getScheme() != '') {
+            return $rel->withPath(self::removeDotSegments($rel->getPath()));
+        }
+
+        if ($rel->getAuthority() != '') {
+            $targetAuthority = $rel->getAuthority();
+            $targetPath = self::removeDotSegments($rel->getPath());
+            $targetQuery = $rel->getQuery();
+        } else {
+            $targetAuthority = $base->getAuthority();
+            if ($rel->getPath() === '') {
+                $targetPath = $base->getPath();
+                $targetQuery = $rel->getQuery() != '' ? $rel->getQuery() : $base->getQuery();
+            } else {
+                if ($rel->getPath()[0] === '/') {
+                    $targetPath = $rel->getPath();
+                } else {
+                    if ($targetAuthority != '' && $base->getPath() === '') {
+                        $targetPath = '/' . $rel->getPath();
+                    } else {
+                        $lastSlashPos = strrpos($base->getPath(), '/');
+                        if ($lastSlashPos === false) {
+                            $targetPath = $rel->getPath();
+                        } else {
+                            $targetPath = substr($base->getPath(), 0, $lastSlashPos + 1) . $rel->getPath();
+                        }
+                    }
+                }
+                $targetPath = self::removeDotSegments($targetPath);
+                $targetQuery = $rel->getQuery();
+            }
+        }
+
+        return new Uri(Uri::composeComponents(
+            $base->getScheme(),
+            $targetAuthority,
+            $targetPath,
+            $targetQuery,
+            $rel->getFragment()
+        ));
+    }
+
+    /**
+     * Returns the target URI as a relative reference from the base URI.
+     *
+     * This method is the counterpart to resolve():
+     *
+     *    (string) $target === (string) UriResolver::resolve($base, UriResolver::relativize($base, $target))
+     *
+     * One use-case is to use the current request URI as base URI and then generate relative links in your documents
+     * to reduce the document size or offer self-contained downloadable document archives.
+     *
+     *    $base = new Uri('http://example.com/a/b/');
+     *    echo UriResolver::relativize($base, new Uri('http://example.com/a/b/c'));  // prints 'c'.
+     *    echo UriResolver::relativize($base, new Uri('http://example.com/a/x/y'));  // prints '../x/y'.
+     *    echo UriResolver::relativize($base, new Uri('http://example.com/a/b/?q')); // prints '?q'.
+     *    echo UriResolver::relativize($base, new Uri('http://example.org/a/b/'));   // prints '//example.org/a/b/'.
+     *
+     * This method also accepts a target that is already relative and will try to relativize it further. Only a
+     * relative-path reference will be returned as-is.
+     *
+     *    echo UriResolver::relativize($base, new Uri('/a/b/c'));  // prints 'c' as well
+     *
+     * @param UriInterface $base   Base URI
+     * @param UriInterface $target Target URI
+     *
+     * @return UriInterface The relative URI reference
+     */
+    public static function relativize(UriInterface $base, UriInterface $target)
+    {
+        if ($target->getScheme() !== '' &&
+            ($base->getScheme() !== $target->getScheme() || $target->getAuthority() === '' && $base->getAuthority() !== '')
+        ) {
+            return $target;
+        }
+
+        if (Uri::isRelativePathReference($target)) {
+            // As the target is already highly relative we return it as-is. It would be possible to resolve
+            // the target with `$target = self::resolve($base, $target);` and then try make it more relative
+            // by removing a duplicate query. But let's not do that automatically.
+            return $target;
+        }
+
+        if ($target->getAuthority() !== '' && $base->getAuthority() !== $target->getAuthority()) {
+            return $target->withScheme('');
+        }
+
+        // We must remove the path before removing the authority because if the path starts with two slashes, the URI
+        // would turn invalid. And we also cannot set a relative path before removing the authority, as that is also
+        // invalid.
+        $emptyPathUri = $target->withScheme('')->withPath('')->withUserInfo('')->withPort(null)->withHost('');
+
+        if ($base->getPath() !== $target->getPath()) {
+            return $emptyPathUri->withPath(self::getRelativePath($base, $target));
+        }
+
+        if ($base->getQuery() === $target->getQuery()) {
+            // Only the target fragment is left. And it must be returned even if base and target fragment are the same.
+            return $emptyPathUri->withQuery('');
+        }
+
+        // If the base URI has a query but the target has none, we cannot return an empty path reference as it would
+        // inherit the base query component when resolving.
+        if ($target->getQuery() === '') {
+            $segments = explode('/', $target->getPath());
+            $lastSegment = end($segments);
+
+            return $emptyPathUri->withPath($lastSegment === '' ? './' : $lastSegment);
+        }
+
+        return $emptyPathUri;
+    }
+
+    private static function getRelativePath(UriInterface $base, UriInterface $target)
+    {
+        $sourceSegments = explode('/', $base->getPath());
+        $targetSegments = explode('/', $target->getPath());
+        array_pop($sourceSegments);
+        $targetLastSegment = array_pop($targetSegments);
+        foreach ($sourceSegments as $i => $segment) {
+            if (isset($targetSegments[$i]) && $segment === $targetSegments[$i]) {
+                unset($sourceSegments[$i], $targetSegments[$i]);
+            } else {
+                break;
+            }
+        }
+        $targetSegments[] = $targetLastSegment;
+        $relativePath = str_repeat('../', count($sourceSegments)) . implode('/', $targetSegments);
+
+        // A reference to am empty last segment or an empty first sub-segment must be prefixed with "./".
+        // This also applies to a segment with a colon character (e.g., "file:colon") that cannot be used
+        // as the first segment of a relative-path reference, as it would be mistaken for a scheme name.
+        if ('' === $relativePath || false !== strpos(explode('/', $relativePath, 2)[0], ':')) {
+            $relativePath = "./$relativePath";
+        } elseif ('/' === $relativePath[0]) {
+            if ($base->getAuthority() != '' && $base->getPath() === '') {
+                // In this case an extra slash is added by resolve() automatically. So we must not add one here.
+                $relativePath = ".$relativePath";
+            } else {
+                $relativePath = "./$relativePath";
+            }
+        }
+
+        return $relativePath;
+    }
+
+    private function __construct()
+    {
+        // cannot be instantiated
+    }
+}
--- a/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/Utils.php
+++ b/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/Utils.php
@@ -0,0 +1,398 @@
+<?php
+
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\RequestInterface;
+use Psr\Http\Message\ServerRequestInterface;
+use Psr\Http\Message\StreamInterface;
+use Psr\Http\Message\UriInterface;
+
+final class Utils
+{
+    /**
+     * Remove the items given by the keys, case insensitively from the data.
+     *
+     * @param iterable<string> $keys
+     *
+     * @return array
+     */
+    public static function caselessRemove($keys, array $data)
+    {
+        $result = [];
+
+        foreach ($keys as &$key) {
+            $key = strtolower($key);
+        }
+
+        foreach ($data as $k => $v) {
+            if (!in_array(strtolower($k), $keys)) {
+                $result[$k] = $v;
+            }
+        }
+
+        return $result;
+    }
+
+    /**
+     * Copy the contents of a stream into another stream until the given number
+     * of bytes have been read.
+     *
+     * @param StreamInterface $source Stream to read from
+     * @param StreamInterface $dest   Stream to write to
+     * @param int             $maxLen Maximum number of bytes to read. Pass -1
+     *                                to read the entire stream.
+     *
+     * @throws \RuntimeException on error.
+     */
+    public static function copyToStream(StreamInterface $source, StreamInterface $dest, $maxLen = -1)
+    {
+        $bufferSize = 8192;
+
+        if ($maxLen === -1) {
+            while (!$source->eof()) {
+                if (!$dest->write($source->read($bufferSize))) {
+                    break;
+                }
+            }
+        } else {
+            $remaining = $maxLen;
+            while ($remaining > 0 && !$source->eof()) {
+                $buf = $source->read(min($bufferSize, $remaining));
+                $len = strlen($buf);
+                if (!$len) {
+                    break;
+                }
+                $remaining -= $len;
+                $dest->write($buf);
+            }
+        }
+    }
+
+    /**
+     * Copy the contents of a stream into a string until the given number of
+     * bytes have been read.
+     *
+     * @param StreamInterface $stream Stream to read
+     * @param int             $maxLen Maximum number of bytes to read. Pass -1
+     *                                to read the entire stream.
+     * @return string
+     *
+     * @throws \RuntimeException on error.
+     */
+    public static function copyToString(StreamInterface $stream, $maxLen = -1)
+    {
+        $buffer = '';
+
+        if ($maxLen === -1) {
+            while (!$stream->eof()) {
+                $buf = $stream->read(1048576);
+                // Using a loose equality here to match on '' and false.
+                if ($buf == null) {
+                    break;
+                }
+                $buffer .= $buf;
+            }
+            return $buffer;
+        }
+
+        $len = 0;
+        while (!$stream->eof() && $len < $maxLen) {
+            $buf = $stream->read($maxLen - $len);
+            // Using a loose equality here to match on '' and false.
+            if ($buf == null) {
+                break;
+            }
+            $buffer .= $buf;
+            $len = strlen($buffer);
+        }
+
+        return $buffer;
+    }
+
+    /**
+     * Calculate a hash of a stream.
+     *
+     * This method reads the entire stream to calculate a rolling hash, based
+     * on PHP's `hash_init` functions.
+     *
+     * @param StreamInterface $stream    Stream to calculate the hash for
+     * @param string          $algo      Hash algorithm (e.g. md5, crc32, etc)
+     * @param bool            $rawOutput Whether or not to use raw output
+     *
+     * @return string Returns the hash of the stream
+     *
+     * @throws \RuntimeException on error.
+     */
+    public static function hash(StreamInterface $stream, $algo, $rawOutput = false)
+    {
+        $pos = $stream->tell();
+
+        if ($pos > 0) {
+            $stream->rewind();
+        }
+
+        $ctx = hash_init($algo);
+        while (!$stream->eof()) {
+            hash_update($ctx, $stream->read(1048576));
+        }
+
+        $out = hash_final($ctx, (bool) $rawOutput);
+        $stream->seek($pos);
+
+        return $out;
+    }
+
+    /**
+     * Clone and modify a request with the given changes.
+     *
+     * This method is useful for reducing the number of clones needed to mutate
+     * a message.
+     *
+     * The changes can be one of:
+     * - method: (string) Changes the HTTP method.
+     * - set_headers: (array) Sets the given headers.
+     * - remove_headers: (array) Remove the given headers.
+     * - body: (mixed) Sets the given body.
+     * - uri: (UriInterface) Set the URI.
+     * - query: (string) Set the query string value of the URI.
+     * - version: (string) Set the protocol version.
+     *
+     * @param RequestInterface $request Request to clone and modify.
+     * @param array            $changes Changes to apply.
+     *
+     * @return RequestInterface
+     */
+    public static function modifyRequest(RequestInterface $request, array $changes)
+    {
+        if (!$changes) {
+            return $request;
+        }
+
+        $headers = $request->getHeaders();
+
+        if (!isset($changes['uri'])) {
+            $uri = $request->getUri();
+        } else {
+            // Remove the host header if one is on the URI
+            if ($host = $changes['uri']->getHost()) {
+                $changes['set_headers']['Host'] = $host;
+
+                if ($port = $changes['uri']->getPort()) {
+                    $standardPorts = ['http' => 80, 'https' => 443];
+                    $scheme = $changes['uri']->getScheme();
+                    if (isset($standardPorts[$scheme]) && $port != $standardPorts[$scheme]) {
+                        $changes['set_headers']['Host'] .= ':'.$port;
+                    }
+                }
+            }
+            $uri = $changes['uri'];
+        }
+
+        if (!empty($changes['remove_headers'])) {
+            $headers = self::caselessRemove($changes['remove_headers'], $headers);
+        }
+
+        if (!empty($changes['set_headers'])) {
+            $headers = self::caselessRemove(array_keys($changes['set_headers']), $headers);
+            $headers = $changes['set_headers'] + $headers;
+        }
+
+        if (isset($changes['query'])) {
+            $uri = $uri->withQuery($changes['query']);
+        }
+
+        if ($request instanceof ServerRequestInterface) {
+            return (new ServerRequest(
+                isset($changes['method']) ? $changes['method'] : $request->getMethod(),
+                $uri,
+                $headers,
+                isset($changes['body']) ? $changes['body'] : $request->getBody(),
+                isset($changes['version'])
+                    ? $changes['version']
+                    : $request->getProtocolVersion(),
+                $request->getServerParams()
+            ))
+            ->withParsedBody($request->getParsedBody())
+            ->withQueryParams($request->getQueryParams())
+            ->withCookieParams($request->getCookieParams())
+            ->withUploadedFiles($request->getUploadedFiles());
+        }
+
+        return new Request(
+            isset($changes['method']) ? $changes['method'] : $request->getMethod(),
+            $uri,
+            $headers,
+            isset($changes['body']) ? $changes['body'] : $request->getBody(),
+            isset($changes['version'])
+                ? $changes['version']
+                : $request->getProtocolVersion()
+        );
+    }
+
+    /**
+     * Read a line from the stream up to the maximum allowed buffer length.
+     *
+     * @param StreamInterface $stream    Stream to read from
+     * @param int|null        $maxLength Maximum buffer length
+     *
+     * @return string
+     */
+    public static function readLine(StreamInterface $stream, $maxLength = null)
+    {
+        $buffer = '';
+        $size = 0;
+
+        while (!$stream->eof()) {
+            // Using a loose equality here to match on '' and false.
+            if (null == ($byte = $stream->read(1))) {
+                return $buffer;
+            }
+            $buffer .= $byte;
+            // Break when a new line is found or the max length - 1 is reached
+            if ($byte === "\n" || ++$size === $maxLength - 1) {
+                break;
+            }
+        }
+
+        return $buffer;
+    }
+
+    /**
+     * Create a new stream based on the input type.
+     *
+     * Options is an associative array that can contain the following keys:
+     * - metadata: Array of custom metadata.
+     * - size: Size of the stream.
+     *
+     * This method accepts the following `$resource` types:
+     * - `Psr\Http\Message\StreamInterface`: Returns the value as-is.
+     * - `string`: Creates a stream object that uses the given string as the contents.
+     * - `resource`: Creates a stream object that wraps the given PHP stream resource.
+     * - `Iterator`: If the provided value implements `Iterator`, then a read-only
+     *   stream object will be created that wraps the given iterable. Each time the
+     *   stream is read from, data from the iterator will fill a buffer and will be
+     *   continuously called until the buffer is equal to the requested read size.
+     *   Subsequent read calls will first read from the buffer and then call `next`
+     *   on the underlying iterator until it is exhausted.
+     * - `object` with `__toString()`: If the object has the `__toString()` method,
+     *   the object will be cast to a string and then a stream will be returned that
+     *   uses the string value.
+     * - `NULL`: When `null` is passed, an empty stream object is returned.
+     * - `callable` When a callable is passed, a read-only stream object will be
+     *   created that invokes the given callable. The callable is invoked with the
+     *   number of suggested bytes to read. The callable can return any number of
+     *   bytes, but MUST return `false` when there is no more data to return. The
+     *   stream object that wraps the callable will invoke the callable until the
+     *   number of requested bytes are available. Any additional bytes will be
+     *   buffered and used in subsequent reads.
+     *
+     * @param resource|string|null|int|float|bool|StreamInterface|callable|\Iterator $resource Entity body data
+     * @param array                                                                  $options  Additional options
+     *
+     * @return StreamInterface
+     *
+     * @throws \InvalidArgumentException if the $resource arg is not valid.
+     */
+    public static function streamFor($resource = '', array $options = [])
+    {
+        if (is_scalar($resource)) {
+            $stream = fopen('php://temp', 'r+');
+            if ($resource !== '') {
+                fwrite($stream, $resource);
+                fseek($stream, 0);
+            }
+            return new Stream($stream, $options);
+        }
+
+        switch (gettype($resource)) {
+            case 'resource':
+                return new Stream($resource, $options);
+            case 'object':
+                if ($resource instanceof StreamInterface) {
+                    return $resource;
+                } elseif ($resource instanceof \Iterator) {
+                    return new PumpStream(function () use ($resource) {
+                        if (!$resource->valid()) {
+                            return false;
+                        }
+                        $result = $resource->current();
+                        $resource->next();
+                        return $result;
+                    }, $options);
+                } elseif (method_exists($resource, '__toString')) {
+                    return Utils::streamFor((string) $resource, $options);
+                }
+                break;
+            case 'NULL':
+                return new Stream(fopen('php://temp', 'r+'), $options);
+        }
+
+        if (is_callable($resource)) {
+            return new PumpStream($resource, $options);
+        }
+
+        throw new \InvalidArgumentException('Invalid resource type: ' . gettype($resource));
+    }
+
+    /**
+     * Safely opens a PHP stream resource using a filename.
+     *
+     * When fopen fails, PHP normally raises a warning. This function adds an
+     * error handler that checks for errors and throws an exception instead.
+     *
+     * @param string $filename File to open
+     * @param string $mode     Mode used to open the file
+     *
+     * @return resource
+     *
+     * @throws \RuntimeException if the file cannot be opened
+     */
+    public static function tryFopen($filename, $mode)
+    {
+        $ex = null;
+        set_error_handler(function () use ($filename, $mode, &$ex) {
+            $ex = new \RuntimeException(sprintf(
+                'Unable to open %s using mode %s: %s',
+                $filename,
+                $mode,
+                func_get_args()[1]
+            ));
+        });
+
+        $handle = fopen($filename, $mode);
+        restore_error_handler();
+
+        if ($ex) {
+            /** @var $ex \RuntimeException */
+            throw $ex;
+        }
+
+        return $handle;
+    }
+
+    /**
+     * Returns a UriInterface for the given value.
+     *
+     * This function accepts a string or UriInterface and returns a
+     * UriInterface for the given value. If the value is already a
+     * UriInterface, it is returned as-is.
+     *
+     * @param string|UriInterface $uri
+     *
+     * @return UriInterface
+     *
+     * @throws \InvalidArgumentException
+     */
+    public static function uriFor($uri)
+    {
+        if ($uri instanceof UriInterface) {
+            return $uri;
+        }
+
+        if (is_string($uri)) {
+            return new Uri($uri);
+        }
+
+        throw new \InvalidArgumentException('URI must be a string or UriInterface');
+    }
+}
--- a/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/functions.php
+++ b/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/functions.php
@@ -0,0 +1,417 @@
+<?php
+
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\MessageInterface;
+use Psr\Http\Message\RequestInterface;
+use Psr\Http\Message\StreamInterface;
+use Psr\Http\Message\UriInterface;
+
+/**
+ * Returns the string representation of an HTTP message.
+ *
+ * @param MessageInterface $message Message to convert to a string.
+ *
+ * @return string
+ *
+ * @deprecated str will be removed in guzzlehttp/psr7:2.0. Use Message::toString instead.
+ */
+function str(MessageInterface $message)
+{
+    return Message::toString($message);
+}
+
+/**
+ * Returns a UriInterface for the given value.
+ *
+ * This function accepts a string or UriInterface and returns a
+ * UriInterface for the given value. If the value is already a
+ * UriInterface, it is returned as-is.
+ *
+ * @param string|UriInterface $uri
+ *
+ * @return UriInterface
+ *
+ * @throws \InvalidArgumentException
+ *
+ * @deprecated uri_for will be removed in guzzlehttp/psr7:2.0. Use Utils::uriFor instead.
+ */
+function uri_for($uri)
+{
+    return Utils::uriFor($uri);
+}
+
+/**
+ * Create a new stream based on the input type.
+ *
+ * Options is an associative array that can contain the following keys:
+ * - metadata: Array of custom metadata.
+ * - size: Size of the stream.
+ *
+ * This method accepts the following `$resource` types:
+ * - `Psr\Http\Message\StreamInterface`: Returns the value as-is.
+ * - `string`: Creates a stream object that uses the given string as the contents.
+ * - `resource`: Creates a stream object that wraps the given PHP stream resource.
+ * - `Iterator`: If the provided value implements `Iterator`, then a read-only
+ *   stream object will be created that wraps the given iterable. Each time the
+ *   stream is read from, data from the iterator will fill a buffer and will be
+ *   continuously called until the buffer is equal to the requested read size.
+ *   Subsequent read calls will first read from the buffer and then call `next`
+ *   on the underlying iterator until it is exhausted.
+ * - `object` with `__toString()`: If the object has the `__toString()` method,
+ *   the object will be cast to a string and then a stream will be returned that
+ *   uses the string value.
+ * - `NULL`: When `null` is passed, an empty stream object is returned.
+ * - `callable` When a callable is passed, a read-only stream object will be
+ *   created that invokes the given callable. The callable is invoked with the
+ *   number of suggested bytes to read. The callable can return any number of
+ *   bytes, but MUST return `false` when there is no more data to return. The
+ *   stream object that wraps the callable will invoke the callable until the
+ *   number of requested bytes are available. Any additional bytes will be
+ *   buffered and used in subsequent reads.
+ *
+ * @param resource|string|null|int|float|bool|StreamInterface|callable|\Iterator $resource Entity body data
+ * @param array                                                                  $options  Additional options
+ *
+ * @return StreamInterface
+ *
+ * @throws \InvalidArgumentException if the $resource arg is not valid.
+ *
+ * @deprecated stream_for will be removed in guzzlehttp/psr7:2.0. Use Utils::streamFor instead.
+ */
+function stream_for($resource = '', array $options = [])
+{
+    return Utils::streamFor($resource, $options);
+}
+
+/**
+ * Parse an array of header values containing ";" separated data into an
+ * array of associative arrays representing the header key value pair data
+ * of the header. When a parameter does not contain a value, but just
+ * contains a key, this function will inject a key with a '' string value.
+ *
+ * @param string|array $header Header to parse into components.
+ *
+ * @return array Returns the parsed header values.
+ *
+ * @deprecated parse_header will be removed in guzzlehttp/psr7:2.0. Use Header::parse instead.
+ */
+function parse_header($header)
+{
+    return Header::parse($header);
+}
+
+/**
+ * Converts an array of header values that may contain comma separated
+ * headers into an array of headers with no comma separated values.
+ *
+ * @param string|array $header Header to normalize.
+ *
+ * @return array Returns the normalized header field values.
+ *
+ * @deprecated normalize_header will be removed in guzzlehttp/psr7:2.0. Use Header::normalize instead.
+ */
+function normalize_header($header)
+{
+    return Header::normalize($header);
+}
+
+/**
+ * Clone and modify a request with the given changes.
+ *
+ * This method is useful for reducing the number of clones needed to mutate a
+ * message.
+ *
+ * The changes can be one of:
+ * - method: (string) Changes the HTTP method.
+ * - set_headers: (array) Sets the given headers.
+ * - remove_headers: (array) Remove the given headers.
+ * - body: (mixed) Sets the given body.
+ * - uri: (UriInterface) Set the URI.
+ * - query: (string) Set the query string value of the URI.
+ * - version: (string) Set the protocol version.
+ *
+ * @param RequestInterface $request Request to clone and modify.
+ * @param array            $changes Changes to apply.
+ *
+ * @return RequestInterface
+ *
+ * @deprecated modify_request will be removed in guzzlehttp/psr7:2.0. Use Utils::modifyRequest instead.
+ */
+function modify_request(RequestInterface $request, array $changes)
+{
+    return Utils::modifyRequest($request, $changes);
+}
+
+/**
+ * Attempts to rewind a message body and throws an exception on failure.
+ *
+ * The body of the message will only be rewound if a call to `tell()` returns a
+ * value other than `0`.
+ *
+ * @param MessageInterface $message Message to rewind
+ *
+ * @throws \RuntimeException
+ *
+ * @deprecated rewind_body will be removed in guzzlehttp/psr7:2.0. Use Message::rewindBody instead.
+ */
+function rewind_body(MessageInterface $message)
+{
+    Message::rewindBody($message);
+}
+
+/**
+ * Safely opens a PHP stream resource using a filename.
+ *
+ * When fopen fails, PHP normally raises a warning. This function adds an
+ * error handler that checks for errors and throws an exception instead.
+ *
+ * @param string $filename File to open
+ * @param string $mode     Mode used to open the file
+ *
+ * @return resource
+ *
+ * @throws \RuntimeException if the file cannot be opened
+ *
+ * @deprecated try_fopen will be removed in guzzlehttp/psr7:2.0. Use Utils::tryFopen instead.
+ */
+function try_fopen($filename, $mode)
+{
+    return Utils::tryFopen($filename, $mode);
+}
+
+/**
+ * Copy the contents of a stream into a string until the given number of
+ * bytes have been read.
+ *
+ * @param StreamInterface $stream Stream to read
+ * @param int             $maxLen Maximum number of bytes to read. Pass -1
+ *                                to read the entire stream.
+ * @return string
+ *
+ * @throws \RuntimeException on error.
+ *
+ * @deprecated copy_to_string will be removed in guzzlehttp/psr7:2.0. Use Utils::copyToString instead.
+ */
+function copy_to_string(StreamInterface $stream, $maxLen = -1)
+{
+    return Utils::copyToString($stream, $maxLen);
+}
+
+/**
+ * Copy the contents of a stream into another stream until the given number
+ * of bytes have been read.
+ *
+ * @param StreamInterface $source Stream to read from
+ * @param StreamInterface $dest   Stream to write to
+ * @param int             $maxLen Maximum number of bytes to read. Pass -1
+ *                                to read the entire stream.
+ *
+ * @throws \RuntimeException on error.
+ *
+ * @deprecated copy_to_stream will be removed in guzzlehttp/psr7:2.0. Use Utils::copyToStream instead.
+ */
+function copy_to_stream(StreamInterface $source, StreamInterface $dest, $maxLen = -1)
+{
+    return Utils::copyToStream($source, $dest, $maxLen);
+}
+
+/**
+ * Calculate a hash of a stream.
+ *
+ * This method reads the entire stream to calculate a rolling hash, based on
+ * PHP's `hash_init` functions.
+ *
+ * @param StreamInterface $stream    Stream to calculate the hash for
+ * @param string          $algo      Hash algorithm (e.g. md5, crc32, etc)
+ * @param bool            $rawOutput Whether or not to use raw output
+ *
+ * @return string Returns the hash of the stream
+ *
+ * @throws \RuntimeException on error.
+ *
+ * @deprecated hash will be removed in guzzlehttp/psr7:2.0. Use Utils::hash instead.
+ */
+function hash(StreamInterface $stream, $algo, $rawOutput = false)
+{
+    return Utils::hash($stream, $algo, $rawOutput);
+}
+
+/**
+ * Read a line from the stream up to the maximum allowed buffer length.
+ *
+ * @param StreamInterface $stream    Stream to read from
+ * @param int|null        $maxLength Maximum buffer length
+ *
+ * @return string
+ *
+ * @deprecated readline will be removed in guzzlehttp/psr7:2.0. Use Utils::readLine instead.
+ */
+function readline(StreamInterface $stream, $maxLength = null)
+{
+    return Utils::readLine($stream, $maxLength);
+}
+
+/**
+ * Parses a request message string into a request object.
+ *
+ * @param string $message Request message string.
+ *
+ * @return Request
+ *
+ * @deprecated parse_request will be removed in guzzlehttp/psr7:2.0. Use Message::parseRequest instead.
+ */
+function parse_request($message)
+{
+    return Message::parseRequest($message);
+}
+
+/**
+ * Parses a response message string into a response object.
+ *
+ * @param string $message Response message string.
+ *
+ * @return Response
+ *
+ * @deprecated parse_response will be removed in guzzlehttp/psr7:2.0. Use Message::parseResponse instead.
+ */
+function parse_response($message)
+{
+    return Message::parseResponse($message);
+}
+
+/**
+ * Parse a query string into an associative array.
+ *
+ * If multiple values are found for the same key, the value of that key value
+ * pair will become an array. This function does not parse nested PHP style
+ * arrays into an associative array (e.g., `foo[a]=1&foo[b]=2` will be parsed
+ * into `['foo[a]' => '1', 'foo[b]' => '2'])`.
+ *
+ * @param string   $str         Query string to parse
+ * @param int|bool $urlEncoding How the query string is encoded
+ *
+ * @return array
+ *
+ * @deprecated parse_query will be removed in guzzlehttp/psr7:2.0. Use Query::parse instead.
+ */
+function parse_query($str, $urlEncoding = true)
+{
+    return Query::parse($str, $urlEncoding);
+}
+
+/**
+ * Build a query string from an array of key value pairs.
+ *
+ * This function can use the return value of `parse_query()` to build a query
+ * string. This function does not modify the provided keys when an array is
+ * encountered (like `http_build_query()` would).
+ *
+ * @param array     $params   Query string parameters.
+ * @param int|false $encoding Set to false to not encode, PHP_QUERY_RFC3986
+ *                            to encode using RFC3986, or PHP_QUERY_RFC1738
+ *                            to encode using RFC1738.
+ * @return string
+ *
+ * @deprecated build_query will be removed in guzzlehttp/psr7:2.0. Use Query::build instead.
+ */
+function build_query(array $params, $encoding = PHP_QUERY_RFC3986)
+{
+    return Query::build($params, $encoding);
+}
+
+/**
+ * Determines the mimetype of a file by looking at its extension.
+ *
+ * @param string $filename
+ *
+ * @return string|null
+ *
+ * @deprecated mimetype_from_filename will be removed in guzzlehttp/psr7:2.0. Use MimeType::fromFilename instead.
+ */
+function mimetype_from_filename($filename)
+{
+    return MimeType::fromFilename($filename);
+}
+
+/**
+ * Maps a file extensions to a mimetype.
+ *
+ * @param $extension string The file extension.
+ *
+ * @return string|null
+ *
+ * @link http://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x/conf/mime.types
+ * @deprecated mimetype_from_extension will be removed in guzzlehttp/psr7:2.0. Use MimeType::fromExtension instead.
+ */
+function mimetype_from_extension($extension)
+{
+    return MimeType::fromExtension($extension);
+}
+
+/**
+ * Parses an HTTP message into an associative array.
+ *
+ * The array contains the "start-line" key containing the start line of
+ * the message, "headers" key containing an associative array of header
+ * array values, and a "body" key containing the body of the message.
+ *
+ * @param string $message HTTP request or response to parse.
+ *
+ * @return array
+ *
+ * @internal
+ * @deprecated _parse_message will be removed in guzzlehttp/psr7:2.0. Use Message::parseMessage instead.
+ */
+function _parse_message($message)
+{
+    return Message::parseMessage($message);
+}
+
+/**
+ * Constructs a URI for an HTTP request message.
+ *
+ * @param string $path    Path from the start-line
+ * @param array  $headers Array of headers (each value an array).
+ *
+ * @return string
+ *
+ * @internal
+ * @deprecated _parse_request_uri will be removed in guzzlehttp/psr7:2.0. Use Message::parseRequestUri instead.
+ */
+function _parse_request_uri($path, array $headers)
+{
+    return Message::parseRequestUri($path, $headers);
+}
+
+/**
+ * Get a short summary of the message body.
+ *
+ * Will return `null` if the response is not printable.
+ *
+ * @param MessageInterface $message    The message to get the body summary
+ * @param int              $truncateAt The maximum allowed size of the summary
+ *
+ * @return string|null
+ *
+ * @deprecated get_message_body_summary will be removed in guzzlehttp/psr7:2.0. Use Message::bodySummary instead.
+ */
+function get_message_body_summary(MessageInterface $message, $truncateAt = 120)
+{
+    return Message::bodySummary($message, $truncateAt);
+}
+
+/**
+ * Remove the items given by the keys, case insensitively from the data.
+ *
+ * @param iterable<string> $keys
+ *
+ * @return array
+ *
+ * @internal
+ * @deprecated _caseless_remove will be removed in guzzlehttp/psr7:2.0. Use Utils::caselessRemove instead.
+ */
+function _caseless_remove($keys, array $data)
+{
+    return Utils::caselessRemove($keys, $data);
+}
--- a/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/functions_include.php
+++ b/plugins/stPayNowPlugin/vendor/guzzlehttp/psr7/src/functions_include.php
@@ -0,0 +1,6 @@
+<?php
+
+// Don't redefine the functions if included multiple times.
+if (!function_exists('GuzzleHttp\Psr7\str')) {
+    require __DIR__ . '/functions.php';
+}
--- a/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/CHANGELOG.md
+++ b/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/CHANGELOG.md
@@ -0,0 +1,28 @@
+## 1.1.0
+- Fixed signature calculation with special chars
+
+## 1.0.6
+- Marked `getErrorType` for `Error` as deprecated
+- Fixed hash calculation for slashed data
+
+## 1.0.5
+- Fixed missing headers for payment status
+
+## 1.0.4
+- Added support for `signature` from headers
+
+## 1.0.3
+- Fixed dependencies
+- Fixed examples for README file
+- Added Travis CI support
+
+## 1.0.2
+- Changed Http Client
+
+## 1.0.1
+- Added implicit Idempotency Key for payment authorize
+- Added Payment Status enums
+- Removed User-agent version
+
+## 1.0.0
+- Initial release
--- a/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/LICENSE
+++ b/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2019 mBank S.A.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
--- a/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/README.md
+++ b/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/README.md
@@ -0,0 +1,70 @@
+# Paynow PHP SDK
+
+[![Latest Version](https://img.shields.io/github/release/pay-now/paynow-php-sdk.svg?style=flat-square)](https://github.com/pay-now/paynow-php-sdk/releases)
+[![Build Status](https://travis-ci.org/pay-now/paynow-php-sdk.svg?branch=master)](https://travis-ci.org/pay-now/paynow-php-sdk)
+[![Software License](https://img.shields.io/badge/license-MIT-brightgreen.svg?style=flat-square)](LICENSE)
+<!--[![Total Downloads](https://img.shields.io/packagist/dt/pay-now/paynow-php-sdk.svg?style=flat-square)](https://packagist.org/packages/pay-now/paynow-php-sdk)-->
+
+Paynow PHP Library provides access to Paynow API from Applications written in PHP language. 
+
+## Installation
+
+### Composer
+Install the library using [Composer](https://getcomposer.org)
+```bash
+$ composer require pay-now/paynow-php-sdk
+```
+and include composer autoloader
+```php
+require_once('vendor/autoload.php');
+```
+
+## Usage
+Making a payment
+```php
+$client = new \Paynow\Client('TestApiKey', 'TestSignatureKey', Environment::SANDBOX);
+$orderReference = "success_1234567";
+$idempotencyKey = uniqid($orderReference . '_');
+
+$paymentData = [
+    "amount" => "100",
+    "currency" => "PLN",
+    "externalId" => $orderReference,
+    "description" => "Payment description",
+    "buyer" => [
+        "email" => "customer@domain.com"
+    ]
+];
+
+try {
+    $payment = new \Paynow\Service\Payment($client);
+    $result = $payment->authorize($paymentData, $idempotencyKey);
+} catch (PaynowException $exception) {
+    // catch errors
+}
+```
+
+Handling notification with current payment status
+```php
+$payload = trim(file_get_contents('php://input'));
+$headers = getallheaders();
+$notificationData = json_decode($payload, true);
+
+try {
+    new \Paynow\Notification('TestSignatureKey', $payload, $headers);
+    // process notification with $notificationData
+} catch (\Exception $exception) {
+    header('HTTP/1.1 400 Bad Request', true, 400);
+}
+
+header('HTTP/1.1 202 Accepted', true, 202);
+```
+
+## Documentation
+See the [Paynow API documentation](https://docs.paynow.pl)
+
+## Support
+If you have any questions or issues, please contact our support at support@paynow.pl.
+
+## License
+MIT license. For more information see the [LICENSE file](LICENSE)
--- a/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/composer.json
+++ b/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/composer.json
@@ -0,0 +1,49 @@
+{
+  "name": "pay-now/paynow-php-sdk",
+  "description": "PHP client library for accessing Paynow API",
+  "version": "1.1.0",
+  "keywords": [
+    "paynow",
+    "mbank",
+    "payment processing",
+    "api"
+  ],
+  "type": "library",
+  "homepage": "https://www.paynow.pl",
+  "license": "MIT",
+  "authors": [
+    {
+      "name": "mBank S.A.",
+      "email": "kontakt@paynow.pl"
+    }
+  ],
+  "minimum-stability": "stable",
+  "prefer-stable": true,
+  "require": {
+    "php": "^5.6 || ~7.0",
+    "ext-curl": "*",
+    "ext-json": "*",
+    "guzzlehttp/psr7": "^1.6",
+    "php-http/curl-client": "^1.7",
+    "php-http/message": "^1.7"
+  },
+  "require-dev": {
+    "php-http/mock-client": "^1.3",
+    "phpunit/phpunit": "^5.7",
+    "squizlabs/php_codesniffer": "^3.4",
+    "friendsofphp/php-cs-fixer": "^2.15",
+    "phpcompatibility/php-compatibility": "^9.3",
+    "dealerdirect/phpcodesniffer-composer-installer": "^0.5.0"
+  },
+  "autoload": {
+    "psr-4": {
+      "Paynow\\": "src/Paynow/",
+      "Paynow\\Tests\\": "tests"
+    }
+  },
+  "scripts": {
+    "test": "vendor/bin/phpunit",
+    "cs-check": "php-cs-fixer fix --no-interaction --dry-run --diff",
+    "cs-fix": "php-cs-fixer fix -v --diff"
+  }
+}
--- a/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/phpunit.xml
+++ b/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/phpunit.xml
@@ -0,0 +1,17 @@
+<phpunit bootstrap="tests/bootstrap.php"
+         colors="false">
+    <testsuites>
+        <testsuite name="Paynow PHP Test Suite">
+            <directory suffix="Test.php">tests</directory>
+        </testsuite>
+    </testsuites>
+    <filter>
+        <whitelist>
+            <directory suffix=".php">./src</directory>
+            <exclude>
+                <directory>vendor</directory>
+                <directory suffix=".php">tests</directory>
+            </exclude>
+        </whitelist>
+    </filter>
+</phpunit>
--- a/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/src/Paynow/Client.php
+++ b/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/src/Paynow/Client.php
@@ -0,0 +1,52 @@
+<?php
+
+namespace Paynow;
+
+use Paynow\HttpClient\HttpClientInterface;
+
+class Client
+{
+    private $configuration;
+
+    private $httpClient;
+
+    /**
+     * @param $apiKey
+     * @param $apiSignatureKey
+     * @param $environment
+     * @param $applicationName
+     */
+    public function __construct($apiKey, $apiSignatureKey, $environment, $applicationName = null)
+    {
+        $this->configuration = new Configuration();
+        $this->configuration->setApiKey($apiKey);
+        $this->configuration->setSignatureKey($apiSignatureKey);
+        $this->configuration->setEnvironment($environment);
+        $this->configuration->setApplicationName($applicationName);
+        $this->httpClient = new HttpClient\HttpClient($this->configuration);
+    }
+
+    /**
+     * @return Configuration
+     */
+    public function getConfiguration()
+    {
+        return $this->configuration;
+    }
+
+    /**
+     * @param HttpClientInterface $httpClient
+     */
+    public function setHttpClient(HttpClientInterface $httpClient)
+    {
+        $this->httpClient = $httpClient;
+    }
+
+    /**
+     * @return HttpClient\HttpClient
+     */
+    public function getHttpClient()
+    {
+        return $this->httpClient;
+    }
+}
--- a/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/src/Paynow/Configuration.php
+++ b/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/src/Paynow/Configuration.php
@@ -0,0 +1,132 @@
+<?php
+
+namespace Paynow;
+
+class Configuration implements ConfigurationInterface
+{
+    const API_VERSION = 'v1';
+    const API_PRODUCTION_URL = 'https://api.paynow.pl/';
+    const API_SANDBOX_URL = 'https://api.sandbox.paynow.pl/';
+    const USER_AGENT = 'paynow-php-sdk';
+
+    /**
+     * @var array
+     */
+    protected $data = [];
+
+    /**
+     * Set a key value pair
+     *
+     * @param string $key   Key to set
+     * @param mixed  $value Value to set
+     */
+    private function set($key, $value)
+    {
+        $this->data[$key] = $value;
+    }
+
+    /**
+     * Get a specific key value
+     *
+     * @param string $key key to retrieve
+     * @return mixed|null Value of the key or NULL
+     */
+    private function get($key)
+    {
+        return isset($this->data[$key]) ? $this->data[$key] : null;
+    }
+
+    /**
+     * Get an API key
+     *
+     * @return mixed|null
+     */
+    public function getApiKey()
+    {
+        return $this->get('api_key');
+    }
+
+    /**
+     * Get Signature key
+     *
+     * @return mixed|null
+     */
+    public function getSignatureKey()
+    {
+        return $this->get('signature_key');
+    }
+
+    /**
+     * Get environment name
+     *
+     * @return mixed|null
+     */
+    public function getEnvironment()
+    {
+        return $this->get('environment');
+    }
+
+    /**
+     * Get API url
+     *
+     * @return mixed|null
+     */
+    public function getUrl()
+    {
+        return $this->get('url');
+    }
+
+    /**
+     * Set an API Key
+     *
+     * @param $apiKey
+     */
+    public function setApiKey($apiKey)
+    {
+        $this->set('api_key', $apiKey);
+    }
+
+    /**
+     * Set Signature Key
+     *
+     * @param $signatureKey
+     */
+    public function setSignatureKey($signatureKey)
+    {
+        $this->set('signature_key', $signatureKey);
+    }
+
+    /**
+     * Set environment
+     *
+     * @param $environment
+     */
+    public function setEnvironment($environment)
+    {
+        if (Environment::PRODUCTION === $environment) {
+            $this->set('environment', Environment::PRODUCTION);
+            $this->set('url', self::API_PRODUCTION_URL);
+        } else {
+            $this->set('environment', Environment::SANDBOX);
+            $this->set('url', self::API_SANDBOX_URL);
+        }
+    }
+
+    /**
+     * Set an application name
+     *
+     * @param $applicationName
+     */
+    public function setApplicationName($applicationName)
+    {
+        $this->set('application_name', $applicationName);
+    }
+
+    /**
+     * @return mixed|null
+     */
+    public function getApplicationName()
+    {
+        return $this->get('application_name');
+    }
+}
--- a/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/src/Paynow/ConfigurationInterface.php
+++ b/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/src/Paynow/ConfigurationInterface.php
@@ -0,0 +1,14 @@
+<?php
+
+namespace Paynow;
+
+interface ConfigurationInterface
+{
+    public function getApiKey();
+
+    public function getSignatureKey();
+
+    public function getEnvironment();
+
+    public function getUrl();
+}
--- a/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/src/Paynow/Environment.php
+++ b/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/src/Paynow/Environment.php
@@ -0,0 +1,9 @@
+<?php
+
+namespace Paynow;
+
+class Environment
+{
+    const PRODUCTION = 'production';
+    const SANDBOX = 'sandbox';
+}
--- a/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/src/Paynow/Exception/ConfigurationException.php
+++ b/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/src/Paynow/Exception/ConfigurationException.php
@@ -0,0 +1,7 @@
+<?php
+
+namespace Paynow\Exception;
+
+class ConfigurationException extends PaynowException
+{
+}
--- a/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/src/Paynow/Exception/Error.php
+++ b/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/src/Paynow/Exception/Error.php
@@ -0,0 +1,39 @@
+<?php
+
+namespace Paynow\Exception;
+
+class Error
+{
+    /**
+     * @var string
+     */
+    private $errorType;
+
+    /**
+     * @var string
+     */
+    private $message;
+
+    public function __construct($errorType, $message)
+    {
+        $this->errorType = $errorType;
+        $this->message = $message;
+    }
+
+    /**
+     * @deprecated
+     * @return string
+     */
+    public function getErrorType()
+    {
+        return $this->errorType;
+    }
+
+    /**
+     * @return string
+     */
+    public function getMessage()
+    {
+        return $this->message;
+    }
+}
--- a/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/src/Paynow/Exception/PaynowException.php
+++ b/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/src/Paynow/Exception/PaynowException.php
@@ -0,0 +1,33 @@
+<?php
+
+namespace Paynow\Exception;
+
+use Exception;
+
+class PaynowException extends Exception
+{
+    private $errors;
+
+    public function __construct($message = '', $code = 0, $body = null)
+    {
+        parent::__construct($message, $code, null);
+
+        if ($body) {
+            $json = json_decode($body);
+            if ($json->errors) {
+                foreach ($json->errors as $error) {
+                    $this->errors[] = new Error($error->errorType, $error->message);
+                }
+                $this->errors = $json->errors;
+            }
+        }
+    }
+
+    /**
+     * @return mixed
+     */
+    public function getErrors()
+    {
+        return $this->errors;
+    }
+}
--- a/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/src/Paynow/Exception/SignatureVerificationException.php
+++ b/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/src/Paynow/Exception/SignatureVerificationException.php
@@ -0,0 +1,7 @@
+<?php
+
+namespace Paynow\Exception;
+
+class SignatureVerificationException extends PaynowException
+{
+}
--- a/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/src/Paynow/HttpClient/ApiResponse.php
+++ b/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/src/Paynow/HttpClient/ApiResponse.php
@@ -0,0 +1,78 @@
+<?php
+
+namespace Paynow\HttpClient;
+
+use Psr\Http\Message\ResponseInterface;
+
+class ApiResponse
+{
+    /**
+     * Body content
+     *
+     * @var string
+     */
+    public $body;
+
+    /**
+     * Http status
+     *
+     * @var int
+     */
+    public $status;
+
+    /**
+     * Headers list
+     *
+     * @var array
+     */
+    protected $headers;
+
+    /**
+     * @param ResponseInterface $response
+     * @throws HttpClientException
+     */
+    public function __construct(ResponseInterface $response)
+    {
+        $this->body = $response->getBody();
+        $this->status = $response->getStatusCode();
+        $this->headers = $response->getHeaders();
+
+        if ($response->getStatusCode() >= 400) {
+            throw new HttpClientException(
+                'Error occurred during processing request',
+                $response->getStatusCode(),
+                $response->getBody()->getContents()
+            );
+        }
+    }
+
+    /**
+     * Parse JSON
+     *
+     * @return mixed
+     */
+    public function decode()
+    {
+        return json_decode($this->body);
+    }
+
+    /**
+     * Get status
+     *
+     * @return int
+     */
+    public function getStatus()
+    {
+        return $this->status;
+    }
+
+    /**
+     * Get headers
+     *
+     * @return array
+     */
+    public function getHeaders()
+    {
+        return $this->headers;
+    }
+}
--- a/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/src/Paynow/HttpClient/HttpClient.php
+++ b/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/src/Paynow/HttpClient/HttpClient.php
@@ -0,0 +1,161 @@
+<?php
+
+namespace Paynow\HttpClient;
+
+use Http\Client\Curl\Client;
+use Http\Client\Exception\RequestException;
+use Http\Message\MessageFactory\GuzzleMessageFactory;
+use Http\Message\StreamFactory\GuzzleStreamFactory;
+use Paynow\Configuration;
+use Paynow\Util\SignatureCalculator;
+use Psr\Http\Message\RequestInterface;
+
+class HttpClient implements HttpClientInterface
+{
+    /**
+     * @var Client
+     */
+    protected $client;
+
+    protected $messageFactory;
+
+    /**
+     * @var Configuration
+     */
+    protected $config;
+
+    /**
+     * @param Configuration $config
+     */
+    public function __construct(Configuration $config)
+    {
+        $this->config = $config;
+        $options = [
+            CURLOPT_CONNECTTIMEOUT => 10,
+        ];
+        $this->messageFactory = new GuzzleMessageFactory();
+        $this->client = new Client($this->messageFactory, new GuzzleStreamFactory(), $options);
+    }
+
+    /**
+     * @return string
+     */
+    private function getUserAgent()
+    {
+        if ($this->config->getApplicationName()) {
+            return $this->config->getApplicationName().' ('.Configuration::USER_AGENT.')';
+        }
+
+        return Configuration::USER_AGENT;
+    }
+
+    /**
+     * @param RequestInterface $request
+     * @throws HttpClientException
+     * @return ApiResponse
+     */
+    private function send(RequestInterface $request)
+    {
+        try {
+            return new ApiResponse($this->client->sendRequest($request));
+        } catch (RequestException $exception) {
+            throw new HttpClientException($exception->getMessage());
+        }
+    }
+
+    /**
+     * @param $url
+     * @param array $data
+     * @param null  $idempotencyKey
+     * @throws HttpClientException
+     * @return ApiResponse
+     */
+    public function post($url, array $data, $idempotencyKey = null)
+    {
+        $headers = $this->prepareHeaders($data);
+
+        if ($idempotencyKey) {
+            $headers['Idempotency-Key'] = $idempotencyKey;
+        }
+
+        $request = $this->messageFactory->createRequest(
+            'POST',
+            $this->config->getUrl().$url,
+            $headers,
+            $this->prepareData($data)
+        );
+
+        try {
+            return $this->send($request);
+        } catch (RequestException $exception) {
+            throw new HttpClientException($exception->getMessage());
+        }
+    }
+
+    /**
+     * @param $url
+     * @param array $data
+     * @throws HttpClientException
+     * @return ApiResponse
+     */
+    public function patch($url, array $data)
+    {
+        $headers = $this->prepareHeaders($data);
+        $request = $this->messageFactory->createRequest(
+            'PATCH',
+            $this->config->getUrl().$url,
+            $headers,
+            $this->prepareData($data)
+        );
+
+        return $this->send($request);
+    }
+
+    /**
+     * @param  $url
+     * @throws HttpClientException
+     * @return ApiResponse
+     */
+    public function get($url)
+    {
+        $request = $this->messageFactory->createRequest(
+            'GET',
+            $this->config->getUrl().$url,
+            $this->prepareHeaders()
+        );
+
+        return $this->send($request);
+    }
+
+    /**
+     * @param array $data
+     * @return string
+     */
+    private function prepareData(array $data)
+    {
+        return json_encode($data);
+    }
+
+    /**
+     * @param null|array|string $data
+     * @return array
+     */
+    private function prepareHeaders($data = null)
+    {
+        $headers = [
+            'Api-Key' => $this->config->getApiKey(),
+            'User-Agent' => $this->getUserAgent(),
+            'Accept' => 'application/json'
+        ];
+
+        if ($data) {
+            $headers['Content-Type'] = 'application/json';
+            if (is_array($data)) {
+                $data = $this->prepareData($data);
+            }
+            $headers['Signature'] = (string)new SignatureCalculator($this->config->getSignatureKey(), $data);
+        }
+
+        return $headers;
+    }
+}
--- a/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/src/Paynow/HttpClient/HttpClientException.php
+++ b/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/src/Paynow/HttpClient/HttpClientException.php
@@ -0,0 +1,61 @@
+<?php
+
+namespace Paynow\HttpClient;
+
+use Exception;
+
+class HttpClientException extends Exception
+{
+    /**
+     * @var string
+     */
+    private $body;
+
+    /**
+     * @var array
+     */
+    private $errors;
+
+    /**
+     * @var int
+     */
+    private $status;
+
+    /**
+     * HttpClientException constructor.
+     *
+     * @param $message
+     * @param $status
+     * @param $body
+     */
+    public function __construct($message, $status = null, $body = null)
+    {
+        parent::__construct($message);
+        $this->status = $status;
+        $this->body = $body;
+    }
+
+    /**
+     * @return string
+     */
+    public function getBody()
+    {
+        return $this->body;
+    }
+
+    /**
+     * @return int
+     */
+    public function getStatus()
+    {
+        return $this->status;
+    }
+
+    /**
+     * @return array
+     */
+    public function getErrors()
+    {
+        return $this->errors;
+    }
+}
--- a/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/src/Paynow/HttpClient/HttpClientInterface.php
+++ b/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/src/Paynow/HttpClient/HttpClientInterface.php
@@ -0,0 +1,12 @@
+<?php
+
+namespace Paynow\HttpClient;
+
+interface HttpClientInterface
+{
+    public function post($url, array $data);
+
+    public function patch($url, array $data);
+
+    public function get($url);
+}
--- a/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/src/Paynow/Model/Payment/Status.php
+++ b/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/src/Paynow/Model/Payment/Status.php
@@ -0,0 +1,12 @@
+<?php
+
+namespace Paynow\Model\Payment;
+
+class Status
+{
+    const STATUS_NEW = 'NEW';
+    const STATUS_PENDING = 'PENDING';
+    const STATUS_REJECTED = 'REJECTED';
+    const STATUS_CONFIRMED = 'CONFIRMED';
+    const STATUS_ERROR = 'ERROR';
+}
--- a/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/src/Paynow/Notification.php
+++ b/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/src/Paynow/Notification.php
@@ -0,0 +1,91 @@
+<?php
+
+namespace Paynow;
+
+use InvalidArgumentException;
+use Paynow\Exception\SignatureVerificationException;
+use Paynow\Util\SignatureCalculator;
+use UnexpectedValueException;
+
+class Notification
+{
+    /**
+     * @param $signatureKey
+     * @param $payload
+     * @param $headers
+     * @throws SignatureVerificationException
+     */
+    public function __construct($signatureKey, $payload, $headers)
+    {
+        if (! $payload) {
+            throw new InvalidArgumentException('No payload has been provided');
+        }
+
+        if (! $headers) {
+            throw new InvalidArgumentException('No headers have been provided');
+        }
+
+        $this->verify($signatureKey, $this->parsePayload($payload), $headers);
+    }
+
+    /**
+     * Parse payload
+     *
+     * @param $payload
+     * @return mixed
+     */
+    private function parsePayload($payload)
+    {
+        $data = json_decode(trim($payload), true);
+        $error = json_last_error();
+
+        if (! $data && JSON_ERROR_NONE !== $error) {
+            throw new UnexpectedValueException("Invalid payload: $error");
+        }
+
+        return $data;
+    }
+
+    /**
+     * Verify payload Signature
+     *
+     * @param $signatureKey
+     * @param $data
+     * @param array $headers
+     * @throws SignatureVerificationException
+     * @return bool
+     */
+    private function verify($signatureKey, $data, array $headers)
+    {
+        $calculatedSignature = (string) new SignatureCalculator($signatureKey, $data);
+        if ($calculatedSignature !== $this->getPayloadSignature($headers)) {
+            throw new SignatureVerificationException('Signature mismatched for payload');
+        }
+
+        return true;
+    }
+
+    /**
+     * Retrieve Signature from payload
+     *
+     * @param array $headers
+     * @throws SignatureVerificationException
+     * @return mixed
+     */
+    private function getPayloadSignature(array $headers)
+    {
+        if (isset($headers['Signature']) && $headers['Signature']) {
+            $signature = $headers['Signature'];
+        }
+
+        if (isset($headers['signature']) && $headers['signature']) {
+            $signature = $headers['signature'];
+        }
+
+        if (empty($signature)) {
+            throw new SignatureVerificationException('No signature was found for payload');
+        }
+
+        return $signature;
+    }
+}
--- a/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/src/Paynow/Service/Payment.php
+++ b/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/src/Paynow/Service/Payment.php
@@ -0,0 +1,60 @@
+<?php
+
+namespace Paynow\Service;
+
+use Paynow\Configuration;
+use Paynow\Exception\PaynowException;
+use Paynow\HttpClient\ApiResponse;
+use Paynow\HttpClient\HttpClientException;
+
+class Payment extends Service
+{
+    /**
+     * Authorize payment
+     *
+     * @param array $data
+     * @param string $idempotencyKey
+     * @throws PaynowException
+     * @return ApiResponse
+     */
+    public function authorize(array $data, $idempotencyKey = null)
+    {
+        try {
+            return $this->getClient()
+                ->getHttpClient()
+                ->post(
+                    Configuration::API_VERSION.'/payments',
+                    $data,
+                    $idempotencyKey ? $idempotencyKey : $data['externalId']
+                )
+                ->decode();
+        } catch (HttpClientException $exception) {
+            throw new PaynowException(
+                $exception->getMessage(),
+                $exception->getStatus(),
+                $exception->getBody()
+            );
+        }
+    }
+
+    /**
+     * @param string $paymentId
+     * @throws PaynowException
+     * @return ApiResponse
+     */
+    public function status($paymentId)
+    {
+        try {
+            return $this->getClient()
+                ->getHttpClient()
+                ->get(Configuration::API_VERSION."/payments/$paymentId/status")
+                ->decode();
+        } catch (HttpClientException $exception) {
+            throw new PaynowException(
+                $exception->getMessage(),
+                $exception->getStatus(),
+                $exception->getBody()
+            );
+        }
+    }
+}
--- a/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/src/Paynow/Service/Service.php
+++ b/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/src/Paynow/Service/Service.php
@@ -0,0 +1,45 @@
+<?php
+
+namespace Paynow\Service;
+
+use Paynow\Client;
+use Paynow\Environment;
+use Paynow\Exception\ConfigurationException;
+
+class Service
+{
+    /**
+     * @var Client
+     */
+    private $client;
+
+    /**
+     * @param Client $client
+     * @throws ConfigurationException
+     */
+    public function __construct(Client $client)
+    {
+        if (! $client->getConfiguration()->getEnvironment()) {
+            $message = 'Provide correct environment, use '.Environment::PRODUCTION.' or '.Environment::SANDBOX;
+            throw new ConfigurationException($message);
+        }
+
+        if (! $client->getConfiguration()->getApiKey()) {
+            throw new ConfigurationException('You did not provide Api Key');
+        }
+
+        if (! $client->getConfiguration()->getSignatureKey()) {
+            throw new ConfigurationException('You did not provide Signature Key');
+        }
+
+        $this->client = $client;
+    }
+
+    /**
+     * @return Client
+     */
+    public function getClient()
+    {
+        return $this->client;
+    }
+}
--- a/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/src/Paynow/Service/ShopConfiguration.php
+++ b/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/src/Paynow/Service/ShopConfiguration.php
@@ -0,0 +1,36 @@
+<?php
+
+namespace Paynow\Service;
+
+use Paynow\Configuration;
+use Paynow\Exception\PaynowException;
+use Paynow\HttpClient\ApiResponse;
+use Paynow\HttpClient\HttpClientException;
+
+class ShopConfiguration extends Service
+{
+    /**
+     * @param string $continueUrl
+     * @param string $notificationUrl
+     * @throws PaynowException
+     * @return ApiResponse
+     */
+    public function changeUrls($continueUrl, $notificationUrl)
+    {
+        $data = [
+            'continueUrl' => $continueUrl,
+            'notificationUrl' => $notificationUrl,
+        ];
+        try {
+            return $this->getClient()
+                ->getHttpClient()
+                ->patch(Configuration::API_VERSION.'/configuration/shop/urls', $data);
+        } catch (HttpClientException $exception) {
+            throw new PaynowException(
+                $exception->getMessage(),
+                $exception->getStatus(),
+                $exception->getBody()
+            );
+        }
+    }
+}
--- a/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/src/Paynow/Util/SignatureCalculator.php
+++ b/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/src/Paynow/Util/SignatureCalculator.php
@@ -0,0 +1,51 @@
+<?php
+
+namespace Paynow\Util;
+
+use InvalidArgumentException;
+
+class SignatureCalculator
+{
+    /**
+     * @var string
+     */
+    protected $hash;
+
+    /**
+     * @param string $signatureKey
+     * @param array|string  $data
+     * @throws InvalidArgumentException
+     */
+    public function __construct($signatureKey, $data)
+    {
+        if (empty($signatureKey)) {
+            throw new InvalidArgumentException('You did not provide a Signature key');
+        }
+
+        if (empty($data)) {
+            throw new InvalidArgumentException('You did not provide any data');
+        }
+
+        if (is_array($data)) {
+            $data = json_encode($data, JSON_UNESCAPED_SLASHES);
+        }
+
+        $this->hash = base64_encode(hash_hmac('sha256', $data, $signatureKey, true));
+    }
+
+    /**
+     * @return string
+     */
+    public function __toString()
+    {
+        return (string) $this->getHash();
+    }
+
+    /**
+     * @return string
+     */
+    public function getHash()
+    {
+        return $this->hash;
+    }
+}
--- a/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/tests/NotificationTest.php
+++ b/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/tests/NotificationTest.php
@@ -0,0 +1,77 @@
+<?php
+
+namespace Paynow\Tests;
+
+use Paynow\Exception\SignatureVerificationException;
+use Paynow\Notification;
+
+class NotificationTest extends TestCase
+{
+    /**
+     * @dataProvider requestsToTest
+     */
+    public function testVerifyPayloadSuccessfully($payload, $headers)
+    {
+        // given
+
+        // when
+        new Notification('s3ecret-k3y', $payload, $headers);
+
+        // then
+        $this->assertTrue(true);
+    }
+
+    public function requestsToTest()
+    {
+        $payload = $this->loadData('notification.json', true);
+        return [
+            [
+                $payload,
+                ['Signature' => 'UZgTT6iSv174R/OyQ2DWRCE9UCmvdXDS8rbQQcjk+AA=']
+            ],
+            [
+                $payload,
+                ['signature' => 'UZgTT6iSv174R/OyQ2DWRCE9UCmvdXDS8rbQQcjk+AA=']
+            ]
+        ];
+    }
+
+    public function testShouldThrowExceptionOnIncorrectSignature()
+    {
+        // given
+        $this->expectException(SignatureVerificationException::class);
+        $payload = $this->loadData('notification.json', true);
+        $headers = ['Signature' => 'Aq/VmN15rtjVbuy9F7Yw+Ym76H+VZjVSuHGpg4dwitY='];
+
+        // when
+        new Notification('s3ecret-k3y', $payload, $headers);
+
+        // then
+    }
+
+    public function testShouldThrowExceptionOnMissingPayload()
+    {
+        // given
+        $this->expectException(\InvalidArgumentException::class);
+        $payload = null;
+        $headers = [];
+
+        // when
+        new Notification('s3ecret-k3y', null, null);
+
+        // then
+    }
+
+    public function testShouldThrowExceptionOnMissingPayloadHeaders()
+    {
+        // given
+        $this->expectException(\InvalidArgumentException::class);
+        $payload = $this->loadData('notification.json', true);
+        $headers = null;
+
+        // when
+        new Notification('s3ecret-k3y', $payload, null);
+
+        // then
+    }
+}
--- a/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/tests/Service/PaymentTest.php
+++ b/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/tests/Service/PaymentTest.php
@@ -0,0 +1,88 @@
+<?php
+
+namespace Paynow\Tests\Service;
+
+use Paynow\Exception\PaynowException;
+use Paynow\Service\Payment;
+use Paynow\Tests\TestCase;
+
+class PaymentTest extends TestCase
+{
+    public function testShouldAuthorizePaymentSuccessfully()
+    {
+        // given
+        $this->testHttpClient->mockResponse('payment_success.json', 200);
+        $this->client->setHttpClient($this->testHttpClient);
+        $paymentService = new Payment($this->client);
+        $paymentData = $this->loadData('payment_request.json');
+
+        // when
+        $response = $paymentService->authorize($paymentData, 'idempotencyKey123');
+
+        // then
+        $this->assertNotEmpty($response->redirectUrl);
+        $this->assertNotEmpty($response->paymentId);
+        $this->assertNotEmpty($response->status);
+    }
+
+    public function testShouldNotAuthorizePaymentSuccessfully()
+    {
+        // given
+        $this->testHttpClient->mockResponse('payment_failed.json', 400);
+        $this->client->setHttpClient($this->testHttpClient);
+
+        $paymentData = $this->loadData('payment_request.json');
+        $paymentService = new Payment($this->client);
+
+        // when
+        try {
+            $response = $paymentService->authorize($paymentData, 'idempotencyKey123');
+        } catch (PaynowException $exception) {
+            // then
+            $this->assertEquals(400, $exception->getCode());
+            $this->assertEquals('VALIDATION_ERROR', $exception->getErrors()[0]->errorType);
+            $this->assertEquals(
+                'currency: invalid field value (EUR)',
+                $exception->getErrors()[0]->message
+            );
+        }
+    }
+
+    public function testShouldRetrievePaymentStatusSuccessfully()
+    {
+        // given
+        $this->testHttpClient->mockResponse('payment_status.json', 200);
+        $this->client->setHttpClient($this->testHttpClient);
+        $paymentService = new Payment($this->client);
+        $paymentId = 'PBYV-3AZ-UPW-DPC';
+
+        // when
+        $response = $paymentService->status($paymentId);
+
+        // then
+        $this->assertEquals($response->paymentId, $paymentId);
+        $this->assertEquals($response->status, 'NEW');
+    }
+
+    public function testShouldNotRetrievePaymentStatusSuccesfully()
+    {
+        // given
+        $this->testHttpClient->mockResponse('payment_status_not_found.json', 404);
+        $this->client->setHttpClient($this->testHttpClient);
+        $paymentService = new Payment($this->client);
+        $paymentId = 'PBYV-3AZ-UPW-DPC';
+
+        // when
+        try {
+            $response = $paymentService->status($paymentId);
+        } catch (PaynowException $exception) {
+            // then
+            $this->assertEquals(404, $exception->getCode());
+            $this->assertEquals('NOT_FOUND', $exception->getErrors()[0]->errorType);
+            $this->assertEquals(
+                'Could not find status for payment {paymentId=PBYV-3AZ-UPW-DPCf}',
+                $exception->getErrors()[0]->message
+            );
+        }
+    }
+}
--- a/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/tests/Service/ShopConfigurationTest.php
+++ b/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/tests/Service/ShopConfigurationTest.php
@@ -0,0 +1,47 @@
+<?php
+
+namespace Paynow\Tests\Service;
+
+use Paynow\Exception\PaynowException;
+use Paynow\Service\ShopConfiguration;
+use Paynow\Tests\TestCase;
+
+class ShopConfigurationTest extends TestCase
+{
+    private $continueUrl = 'http://shopdomain.com/return';
+    private $notificationUrl = 'http://shopdomain.com/notifications';
+
+    public function testShouldUpdateShopConfigurationSuccessfully()
+    {
+        // given
+        $this->testHttpClient->mockResponse(null, 204);
+        $this->client->setHttpClient($this->testHttpClient);
+        $shopConfigurationService = new ShopConfiguration($this->client);
+
+        // when
+        $response = $shopConfigurationService->changeUrls($this->continueUrl, $this->notificationUrl);
+
+        // then
+        $this->assertEquals(204, $response->status);
+    }
+
+    public function testShouldNotUpdateShopConfigurationSuccessfully()
+    {
+        // given
+        $this->testHttpClient->mockResponse('shop_configuration_urls_failed.json', 400);
+        $this->client->setHttpClient($this->testHttpClient);
+        $shopConfigurationService = new ShopConfiguration($this->client);
+        // when
+        try {
+            $response = $shopConfigurationService->changeUrls($this->continueUrl, $this->notificationUrl);
+        } catch (PaynowException $exception) {
+            // then
+            $this->assertEquals(400, $exception->getCode());
+            $this->assertEquals('VALIDATION_ERROR', $exception->getErrors()[0]->errorType);
+            $this->assertEquals(
+                'continue_url: invalid field value',
+                $exception->getErrors()[0]->message
+            );
+        }
+    }
+}
--- a/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/tests/TestCase.php
+++ b/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/tests/TestCase.php
@@ -0,0 +1,36 @@
+<?php
+
+namespace Paynow\Tests;
+
+use Paynow\Client;
+use Paynow\Environment;
+use PHPUnit\Framework\TestCase as BaseTestCase;
+
+class TestCase extends BaseTestCase
+{
+    protected $testHttpClient;
+
+    protected $client;
+
+    public function __construct($name = null, array $data = [], $dataName = '')
+    {
+        $this->client = new Client(
+            'TestApiKey',
+            'TestSignatureKey',
+            Environment::SANDBOX,
+            'PHPUnitTests'
+        );
+        $this->testHttpClient = new TestHttpClient($this->client->getConfiguration());
+        parent::__construct($name, $data, $dataName);
+    }
+
+    public function loadData($fileName, $asString = false)
+    {
+        $filePath = dirname(__FILE__).'/resources/'.$fileName;
+        if (! $asString) {
+            return json_decode(file_get_contents($filePath), true);
+        } else {
+            return file_get_contents($filePath);
+        }
+    }
+}
--- a/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/tests/TestHttpClient.php
+++ b/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/tests/TestHttpClient.php
@@ -0,0 +1,22 @@
+<?php
+
+namespace Paynow\Tests;
+
+use GuzzleHttp\Psr7\Response;
+use Http\Mock\Client;
+use Paynow\HttpClient\HttpClient;
+
+class TestHttpClient extends HttpClient
+{
+    public function mockResponse($responseFile, $httpStatus)
+    {
+        $this->client = new Client();
+        $content = null;
+        if (null != $responseFile) {
+            $filePath = dirname(__FILE__).'/resources/'.$responseFile;
+            $content = file_get_contents($filePath, true);
+        }
+        $response = new Response($httpStatus, ['Content-Type' => 'application/json'], $content);
+        $this->client->addResponse($response);
+    }
+}
--- a/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/tests/Util/SignatureCalculatorTest.php
+++ b/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/tests/Util/SignatureCalculatorTest.php
@@ -0,0 +1,44 @@
+<?php
+
+namespace Paynow\Tests\Util;
+
+use Paynow\Tests\TestCase;
+use Paynow\Util\SignatureCalculator;
+
+class SignatureCalculatorTest extends TestCase
+{
+    public function testNotValidSuccessfully()
+    {
+        // given + when
+        $signatureCalculator = new SignatureCalculator('InvalidSecretKey', ['key' => 'value']);
+
+        // then
+        $this->assertNotEquals('hash', $signatureCalculator->getHash());
+    }
+
+    public function testShouldValidSuccessfully()
+    {
+        // given + when
+        $signatureCalculator = new SignatureCalculator(
+            'a621a1fb-b4d8-48ba-a6a3-2a28ed61f605',
+            [
+                'key1' => 'value1',
+                'key2' => 'val/ue2',
+            ]
+        );
+
+        // then
+        $this->assertEquals('bqD6spGJwPABe58i+mbqsYoF/JLUDR58yqxRqrb0AR0=', $signatureCalculator->getHash());
+    }
+
+    public function testExceptionForEmptyData()
+    {
+        // given
+        $this->expectException(\InvalidArgumentException::class);
+
+        // when
+        $signatureCalculator = new SignatureCalculator('a621a1fb-b4d8-48ba-a6a3-2a28ed61f605', []);
+
+        // then
+    }
+}
--- a/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/tests/bootstrap.php
+++ b/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/tests/bootstrap.php
@@ -0,0 +1,5 @@
+<?php
+
+require_once __DIR__.'/../vendor/autoload.php';
+require_once __DIR__.'/TestCase.php';
+require_once __DIR__.'/TestHttpClient.php';
--- a/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/tests/resources/notification.json
+++ b/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/tests/resources/notification.json
@@ -0,0 +1,5 @@
+{
+  "paymentId": "NOLV-8F9-08K-WGD",
+  "status": "CONFIRMED",
+  "modifiedAt": "2018-12-12T13:24:52"
+}
--- a/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/tests/resources/payment_failed.json
+++ b/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/tests/resources/payment_failed.json
@@ -0,0 +1,9 @@
+{
+  "statusCode": 400,
+  "errors": [
+    {
+      "errorType": "VALIDATION_ERROR",
+      "message": "currency: invalid field value (EUR)"
+    }
+  ]
+}
--- a/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/tests/resources/payment_request.json
+++ b/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/tests/resources/payment_request.json
@@ -0,0 +1,9 @@
+{
+  "amount": 100,
+  "currency": "PLN",
+  "externalId": "success_1234567",
+  "description": "Test payment",
+  "buyer": {
+    "email": "customer@domain.com"
+  }
+}
--- a/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/tests/resources/payment_status.json
+++ b/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/tests/resources/payment_status.json
@@ -0,0 +1,4 @@
+{
+  "paymentId": "PBYV-3AZ-UPW-DPC",
+  "status": "NEW"
+}
--- a/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/tests/resources/payment_status_not_found.json
+++ b/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/tests/resources/payment_status_not_found.json
@@ -0,0 +1,9 @@
+{
+  "statusCode": 404,
+  "errors": [
+    {
+      "errorType": "NOT_FOUND",
+      "message": "Could not find status for payment {paymentId=PBYV-3AZ-UPW-DPCf}"
+    }
+  ]
+}
--- a/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/tests/resources/payment_success.json
+++ b/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/tests/resources/payment_success.json
@@ -0,0 +1,5 @@
+{
+  "redirectUrl": "https://paywall.sandbox.paynow.pl/NO0U-5G2-XC1-ESX?token=eyJraWQiOiJhMDAyNjJjYS02NTU3LTRjOTktOGU0NC1kMTFlMTAxYjhhNTIiLCJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJOTzBVLTVHMi1YQzEtRVNYIiwiYXVkIjoicGF5d2FsbC5zYW5kYm94LnBheW5vdy5wbCIsImlzcyI6InNhbmRib3gucGF5bm93LnBsIiwiZXhwIjoxNTY2ODk5MTYwLCJpYXQiOjE1NjY4MTI3NjB9.25TM-BXTDJV3NLEufgYVNZ7W_0JmJjS2Qu-0-d1HIQM",
+  "paymentId": "NO0U-5G2-XC1-ESX",
+  "status": "NEW"
+}
--- a/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/tests/resources/shop_configuration_urls_failed.json
+++ b/plugins/stPayNowPlugin/vendor/pay-now/paynow-php-sdk/tests/resources/shop_configuration_urls_failed.json
@@ -0,0 +1,9 @@
+{
+  "statusCode": 400,
+  "errors": [
+    {
+      "errorType": "VALIDATION_ERROR",
+      "message": "continue_url: invalid field value"
+    }
+  ]
+}
--- a/plugins/stPayNowPlugin/vendor/php-http/curl-client/CHANGELOG.md
+++ b/plugins/stPayNowPlugin/vendor/php-http/curl-client/CHANGELOG.md
@@ -0,0 +1,173 @@
+# Change Log
+
+## Unreleased
+
+
+## 1.7.1 - 2018-03-36
+
+### Fixed
+
+- #36: Failure evaluating code: is_resource($handle) (string assertions are deprecated in PHP 7.2)
+
+
+## 1.7 - 2017-02-09
+
+### Changed
+
+- #30: Make sure we rewind streams
+
+## 1.6.2 - 2017-01-02
+
+### Fixed
+
+- #29: Request not using CURLOPT_POSTFIELDS have content-length set to 
+
+### Changed
+
+- Use binary mode to create response body stream.
+
+
+## 1.6.1 - 2016-11-11
+
+### Fixed
+
+- #27: ErrorPlugin and sendAsyncRequest() incompatibility
+
+
+## 1.6 - 2016-09-12
+
+### Changed
+
+- `Client::sendRequest` now throws `Http\Client\Exception\NetworkException` on network errors.
+- `\UnexpectedValueException` replaced with `Http\Client\Exception\RequestException` in
+  `Client::sendRequest` and `Client::sendAsyncRequest`
+
+
+## 1.5.1 - 2016-08-29
+
+### Fixed
+
+- #26: Combining CurlClient with StopwatchPlugin causes Promise onRejected handler to never be
+  invoked.
+
+
+## 1.5 - 2016-08-03
+
+### Changed
+
+- Request body can be send with any method except GET, HEAD and TRACE.
+- #25: Make discovery a hard dependency. 
+
+
+## 1.4.2 - 2016-06-14
+
+### Added
+
+- #23: "php-http/async-client-implementation" added to "provide" section.
+
+
+## 1.4.1 - 2016-05-30
+
+### Fixed
+
+- #22: Cannot create the client using `HttpClientDiscovery`.
+
+
+## 1.4 - 2016-03-30
+
+### Changed
+
+- #20: Minimize memory usage when reading large response body.
+
+
+## 1.3 - 2016-03-14
+
+### Fixed
+
+- #18: Invalid "Expect" header.
+
+### Removed
+
+- #13: Remove HeaderParser. 
+
+
+## 1.2 - 2016-03-09
+
+### Added
+
+- #16: Make sure discovery can find the curl client
+
+### Fixed
+
+- #15: "Out of memory" sending large files.
+
+
+## 1.1.0 - 2016-01-29
+
+### Changed
+
+- Switch to php-http/message 1.0.
+
+
+## 1.0.0 - 2016-01-28
+
+First stable release.
+
+
+## 0.7.0 - 2016-01-26
+
+### Changed
+
+- Migrate from `php-http/discovery` and `php-http/utils` to `php-http/message`.
+
+## 0.6.0 - 2016-01-12
+
+### Changed
+
+- Root namespace changed from `Http\Curl` to `Http\Client\Curl`.
+- Main client class name renamed from `CurlHttpClient` to `Client`. 
+- Minimum required [php-http/discovery](https://packagist.org/packages/php-http/discovery)
+  version changed to 0.5.
+
+
+## 0.5.0 - 2015-12-18
+
+### Changed
+
+- Compatibility with php-http/httplug 1.0 beta
+- Switch to php-http/discovery 0.4
+
+
+## 0.4.0 - 2015-12-16
+
+### Changed
+
+- Switch to php-http/message-factory 1.0
+
+
+## 0.3.1 - 2015-12-14
+
+### Changed
+
+- Requirements fixed.
+
+
+## 0.3.0 - 2015-11-24
+
+### Changed
+
+- Use cURL constants as options keys.
+
+
+## 0.2.0 - 2015-11-17
+
+### Added
+
+- HttpAsyncClient support.
+
+
+## 0.1.0 - 2015-11-11
+
+### Added
+
+- Initial release
--- a/Show More
+++ b/Show More