diff --git a/.claude/settings.local.json b/.claude/settings.local.json
index 83c00b77..66ad22ff 100644
--- a/.claude/settings.local.json
+++ b/.claude/settings.local.json
@@ -4,7 +4,10 @@
       "Bash(head:*)",
       "Bash(cp:*)",
       "Bash(cd:*)",
-      "Bash(curl:*)"
+      "Bash(curl:*)",
+      "mcp__plugin_serena_serena__activate_project",
+      "mcp__plugin_serena_serena__check_onboarding_performed",
+      "mcp__plugin_serena_serena__list_dir"
     ]
   }
 }
diff --git a/.serena/project.yml b/.serena/project.yml
index 1f3bf6b2..610826f6 100644
--- a/.serena/project.yml
+++ b/.serena/project.yml
@@ -124,3 +124,12 @@ initial_prompt: ""
 # This overrides the corresponding setting in the global configuration; see the documentation there.
 # If null or missing, use the setting from the global configuration.
 symbol_info_budget:
+
+# line ending convention to use when writing source files.
+# Possible values: unset (use global setting), "lf", "crlf", or "native" (platform default)
+# This does not affect Serena's own files (e.g. memories and configuration files), which always use native line endings.
+line_ending:
+
+# list of regex patterns which, when matched, mark a memory entry as read‑only.
+# Extends the list from the global configuration, merging the two lists.
+read_only_memory_patterns: []
diff --git a/.vscode/ftp-kr.json b/.vscode/ftp-kr.json
index a50740aa..9dcbdcee 100644
--- a/.vscode/ftp-kr.json
+++ b/.vscode/ftp-kr.json
@@ -14,6 +14,7 @@
     ".git",
     "/.vscode",
     "/.serena",
-    "/.claude"
+    "/.claude",
+    "CLAUDE.md"
   ]
 }
\ No newline at end of file
diff --git a/CLAUDE.md b/CLAUDE.md
new file mode 100644
index 00000000..64527e51
--- /dev/null
+++ b/CLAUDE.md
@@ -0,0 +1,69 @@
+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Project Overview
+
+This is a **PrestaShop 1.7.x e-commerce store** (interblue.pl) with a custom theme and multiple custom/third-party modules. The codebase is a live PrestaShop installation deployed via FTP to the production server.
+
+## Architecture
+
+### Directory Structure
+
+- **`themes/InterBlue/`** — Custom theme based on PrestaShop's classic theme. Templates use Smarty (`.tpl`), CSS is compiled from SCSS via VSCode Live Sass Compiler.
+- **`modules/`** — 130+ modules. Custom/in-house modules: `customfeaturetab`, `AddOrderExtraFields`. Key third-party: `x13allegro` (Allegro marketplace), `onepagecheckoutps` (one-page checkout), `baselinker`, `empikmarketplace`, `dpdpoland`/`sensbitinpost`/`sensbitpaczkawruchu`/`sensbitpocztapolska` (shipping carriers).
+- **`override/`** — PrestaShop class/controller overrides. Critical overrides:
+  - `override/classes/order/Order.php` — Modified by `modrefchange` module to fire hooks (`actionBeforeAddOrder`, `actionBeforeAddOrderInvoice`, `actionBeforeAddDeliveryNumber`) before invoice/delivery number assignment.
+  - `override/controllers/front/OrderController.php` — Modified by `onepagecheckoutps` module for one-page checkout flow.
+- **`src/`** — Extended PrestaShop core: `src/Adapter/Order/QueryHandler/` and `src/Core/Domain/Order/` for order viewing query pattern (CQRS).
+
+### Theme Architecture
+
+- **SCSS workflow**: Edit `themes/InterBlue/assets/css/custom.scss` (or `theme.scss`). The VSCode Live Sass Compiler auto-compiles to `custom.css` with autoprefixer on save.
+- Templates override classic theme templates in `themes/InterBlue/templates/`.
+- Default layout is full-width; category pages use left column.
+
+### Module Architecture
+
+Custom modules follow standard PrestaShop module structure:
+- Main PHP class extends `Module`
+- `views/templates/` for Smarty templates
+- `classes/` for business logic
+- DB install/uninstall in `install()`/`uninstall()` methods
+- Hooks registered via `registerHook()` in `install()`
+
+The `customfeaturetab` module (`modules/customfeaturetab/`) uses a custom DB table `ps_custom_feature_tab` to map product features/values to extra product page tabs, displayed via the `displayProductExtraContent` hook.
+
+### Override Conflicts
+
+When adding overrides, check for existing overrides that multiple modules may have contributed to. The `Order.php` override was generated by `AddOrderExtraFields` copying files from `modules/AddOrderExtraFields/_overrides/`. If `modrefchange` module is installed, a different version is used.
+
+**Known issue**: After updating `empikmarketplace`, the admin product catalog list view is overridden by:
+- `modules/empikmarketplace/views/PrestaShop/Admin/Product/CatalogPage/Lists/list.html.twig`
+- `modules/empikmarketplace/views/PrestaShop/Admin/Product/CatalogPage/Lists/products_table.html.twig`
+
+## Development Workflow
+
+### CSS/SCSS
+
+Use the VSCode **Live Sass Compiler** extension. It watches on launch (configured in `.vscode/settings.json`) and compiles SCSS to compressed CSS with sourcemaps and autoprefixing automatically on save.
+
+Main file to edit: [themes/InterBlue/assets/css/custom.scss](themes/InterBlue/assets/css/custom.scss)
+
+### Deployment
+
+Files are deployed to production via FTP using the **SFTP/FTP Sync** VSCode extension (configured in `.vscode/ftp-kr.json`). Upload is not automatic on save — files must be manually synced.
+
+### PrestaShop Cache
+
+After modifying PHP classes, overrides, or templates, PrestaShop's cache must be cleared from the admin panel: **Advanced Parameters → Performance → Clear cache**, or by deleting `var/cache/` on the server.
+
+When creating or modifying overrides, PrestaShop also needs to rebuild the class index (`var/cache/*/class_index.php`).
+
+## Key Conventions
+
+- All custom module display strings use `$this->l('...')` for translation support (Polish locale is primary).
+- Override classes extend `*Core` (e.g., `class Order extends OrderCore`).
+- Module DB tables use `_DB_PREFIX_` constant (typically `ps_`).
+- PrestaShop hooks are the integration point — prefer hooks over direct core edits.
+- The `admin658c34/` directory is the custom admin panel path (security through obscurity).
diff --git a/docs/empik.md b/docs/empik.md
new file mode 100644
index 00000000..e7a47fc0
--- /dev/null
+++ b/docs/empik.md
@@ -0,0 +1,134 @@
+# Modyfikacje modułu empikmarketplace
+
+Data modyfikacji: 2026-03-11
+
+## Problem
+
+Moduł empikmarketplace przy nieudanym imporcie zamówienia z EMPIK do PrestaShop powodował:
+1. Brak powiadomienia o błędzie — nikt nie wiedział, że zamówienie nie przeszło
+2. Dziury w numeracji zamówień (`id_order`) — MySQL AUTO_INCREMENT nie cofa się po ROLLBACK transakcji
+
+## Zmodyfikowane pliki
+
+### `src/Processor/OrderProcessor.php`
+
+Dodany import `Mail` na górze pliku:
+
+```php
+use Mail;
+```
+
+Dodana stała z adresem email do powiadomień:
+
+```php
+class OrderProcessor
+{
+    const CODE_WAITING_ACCEPTANCE = 'WAITING_ACCEPTANCE';
+    const CODE_SHIPPING = 'SHIPPING';
+    const ERROR_NOTIFICATION_EMAIL = 'jacek.pyziak@project-pro.pl';
+```
+
+Zmodyfikowana metoda `import()` — dodano wywołanie resetu AUTO_INCREMENT i wysyłki emaila w bloku catch:
+
+```php
+protected function import(EmpikOrderWrapper $empikOrder)
+{
+    try {
+        Db::getInstance()->execute('START TRANSACTION');
+        $this->orderFulfiller->fulfill($empikOrder);
+        Db::getInstance()->execute('COMMIT');
+    } catch (Exception $e) {
+        Db::getInstance()->execute('ROLLBACK');
+        $this->resetOrderAutoIncrement();
+
+        $data = $empikOrder->getData();
+        $empikOrderId = isset($data['order_id']) ? $data['order_id'] : 'unknown';
+        $errorMsg = sprintf('Error importing EMPIK order [%s]: %s', $empikOrderId, $e->getMessage());
+        $this->logger->logError($errorMsg);
+        $this->sendFailureNotification($empikOrderId, $e);
+    }
+}
+```
+
+Dodana metoda `resetOrderAutoIncrement()` — zapobiega dziurom w numeracji zamówień:
+
+```php
+protected function resetOrderAutoIncrement()
+{
+    try {
+        $lastId = (int) Db::getInstance()->getValue(
+            'SELECT MAX(id_order) FROM ' . _DB_PREFIX_ . 'orders'
+        );
+        Db::getInstance()->execute(
+            'ALTER TABLE ' . _DB_PREFIX_ . 'orders AUTO_INCREMENT = ' . ($lastId + 1)
+        );
+    } catch (Exception $e) {
+        $this->logger->logError(sprintf('Error resetting AUTO_INCREMENT: %s', $e->getMessage()));
+    }
+}
+```
+
+Dodana metoda `sendFailureNotification()` — wysyła email z informacją o błędzie:
+
+```php
+protected function sendFailureNotification($empikOrderId, Exception $exception)
+{
+    try {
+        $shopName = Configuration::get('PS_SHOP_NAME');
+        $subject = sprintf('[%s] Błąd importu zamówienia EMPIK: %s', $shopName, $empikOrderId);
+
+        $body = sprintf(
+            "Zamówienie EMPIK: %s\nData: %s\nBłąd: %s\n\nStack trace:\n%s",
+            $empikOrderId,
+            date('Y-m-d H:i:s'),
+            $exception->getMessage(),
+            $exception->getTraceAsString()
+        );
+
+        Mail::send(
+            (int) Configuration::get('PS_LANG_DEFAULT'),
+            'empik_import_error',
+            $subject,
+            [
+                '{empik_order_id}' => $empikOrderId,
+                '{error_message}' => $exception->getMessage(),
+                '{error_date}' => date('Y-m-d H:i:s'),
+                '{stack_trace}' => nl2br($exception->getTraceAsString()),
+            ],
+            self::ERROR_NOTIFICATION_EMAIL,
+            null,
+            Configuration::get('PS_SHOP_EMAIL'),
+            $shopName,
+            null,
+            null,
+            _PS_MODULE_DIR_ . 'empikmarketplace/mails/'
+        );
+    } catch (Exception $e) {
+        $this->logger->logError(sprintf('Error sending failure notification email: %s', $e->getMessage()));
+    }
+}
+```
+
+## Dodane pliki
+
+### `mails/pl/empik_import_error.html`
+
+Szablon HTML emaila z powiadomieniem o błędzie. Zawiera placeholdery:
+- `{empik_order_id}` — ID zamówienia EMPIK
+- `{error_date}` — data błędu
+- `{error_message}` — komunikat błędu
+- `{stack_trace}` — stack trace wyjątku
+
+### `mails/pl/empik_import_error.txt`
+
+Wersja tekstowa tego samego szablonu (wymagana przez PrestaShop `Mail::send()`).
+
+## Po aktualizacji modułu
+
+Jeśli moduł empikmarketplace zostanie zaktualizowany, powyższe zmiany zostaną nadpisane. Należy ponownie:
+
+1. Dodać `use Mail;` do importów w `OrderProcessor.php`
+2. Dodać stałą `ERROR_NOTIFICATION_EMAIL`
+3. Zmodyfikować metodę `import()` zgodnie z powyższym kodem
+4. Dodać metody `resetOrderAutoIncrement()` i `sendFailureNotification()`
+5. Skopiować szablony emaili do `mails/pl/`
diff --git a/modules/empikmarketplace/NOTATKA-OVERRIDE-TABELI-PRODUKTOW.md b/modules/empikmarketplace/NOTATKA-OVERRIDE-TABELI-PRODUKTOW.md
new file mode 100644
index 00000000..84ed8c0d
--- /dev/null
+++ b/modules/empikmarketplace/NOTATKA-OVERRIDE-TABELI-PRODUKTOW.md
@@ -0,0 +1,9 @@
+# Notatka: override tabeli produktow BO
+
+Data: 2026-02-09
+
+Po aktualizacji modulu `empikmarketplace` wyglad tabeli produktow w panelu administratora PrestaShop zostal nadpisany przez:
+
+- `modules/empikmarketplace/views/PrestaShop/Admin/Product/CatalogPage/Lists/list.html.twig`
+
+To ten plik odpowiada za modyfikacje widoku listy produktow (katalog, BO).
diff --git a/modules/empikmarketplace/mails/pl/empik_import_error.html b/modules/empikmarketplace/mails/pl/empik_import_error.html
new file mode 100644
index 00000000..242c3948
--- /dev/null
+++ b/modules/empikmarketplace/mails/pl/empik_import_error.html
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <meta charset="utf-8">
+    <title>Błąd importu zamówienia EMPIK</title>
+</head>
+<body style="font-family: Arial, sans-serif; font-size: 14px; color: #333;">
+    <h2 style="color: #c0392b;">Błąd importu zamówienia EMPIK</h2>
+    <table style="border-collapse: collapse; width: 100%; max-width: 600px;">
+        <tr>
+            <td style="padding: 8px; border: 1px solid #ddd; font-weight: bold;">Zamówienie EMPIK:</td>
+            <td style="padding: 8px; border: 1px solid #ddd;">{empik_order_id}</td>
+        </tr>
+        <tr>
+            <td style="padding: 8px; border: 1px solid #ddd; font-weight: bold;">Data:</td>
+            <td style="padding: 8px; border: 1px solid #ddd;">{error_date}</td>
+        </tr>
+        <tr>
+            <td style="padding: 8px; border: 1px solid #ddd; font-weight: bold;">Komunikat błędu:</td>
+            <td style="padding: 8px; border: 1px solid #ddd;">{error_message}</td>
+        </tr>
+    </table>
+    <h3>Stack trace:</h3>
+    <pre style="background: #f5f5f5; padding: 10px; font-size: 12px; overflow-x: auto;">{stack_trace}</pre>
+</body>
+</html>
diff --git a/modules/empikmarketplace/mails/pl/empik_import_error.txt b/modules/empikmarketplace/mails/pl/empik_import_error.txt
new file mode 100644
index 00000000..e305aa94
--- /dev/null
+++ b/modules/empikmarketplace/mails/pl/empik_import_error.txt
@@ -0,0 +1,8 @@
+Błąd importu zamówienia EMPIK
+
+Zamówienie EMPIK: {empik_order_id}
+Data: {error_date}
+Komunikat błędu: {error_message}
+
+Stack trace:
+{stack_trace}
diff --git a/modules/empikmarketplace/src/Processor/OrderProcessor.php b/modules/empikmarketplace/src/Processor/OrderProcessor.php
index 29136e00..b90f97d0 100644
--- a/modules/empikmarketplace/src/Processor/OrderProcessor.php
+++ b/modules/empikmarketplace/src/Processor/OrderProcessor.php
@@ -13,12 +13,14 @@ use Empik\Marketplace\OrderFulfiller\OrderFulfiller;
 use Exception;
 use Configuration;
 use Db;
+use Mail;
 use Empik\Marketplace\Provider\Order\ProductRefResolver;
 
 class OrderProcessor
 {
     const CODE_WAITING_ACCEPTANCE = 'WAITING_ACCEPTANCE';
     const CODE_SHIPPING = 'SHIPPING';
+    const ERROR_NOTIFICATION_EMAIL = 'jacek.pyziak@project-pro.pl';
 
     /** @var EmpikClientFactory */
     protected $empikClientFactory;
@@ -98,7 +100,74 @@ class OrderProcessor
             Db::getInstance()->execute('COMMIT');
         } catch (Exception $e) {
             Db::getInstance()->execute('ROLLBACK');
-            $this->logger->logError(sprintf('Error importing order [%s]', $e->getMessage()));
+            $this->resetOrderAutoIncrement();
+
+            $data = $empikOrder->getData();
+            $empikOrderId = isset($data['order_id']) ? $data['order_id'] : 'unknown';
+            $errorMsg = sprintf('Error importing EMPIK order [%s]: %s', $empikOrderId, $e->getMessage());
+            $this->logger->logError($errorMsg);
+            $this->sendFailureNotification($empikOrderId, $e);
+        }
+    }
+
+    /**
+     * Resetuje AUTO_INCREMENT tabeli ps_orders do MAX(id_order) + 1
+     * aby uniknąć dziur w numeracji zamówień po ROLLBACK.
+     */
+    protected function resetOrderAutoIncrement()
+    {
+        try {
+            $lastId = (int) Db::getInstance()->getValue(
+                'SELECT MAX(id_order) FROM ' . _DB_PREFIX_ . 'orders'
+            );
+            Db::getInstance()->execute(
+                'ALTER TABLE ' . _DB_PREFIX_ . 'orders AUTO_INCREMENT = ' . ($lastId + 1)
+            );
+        } catch (Exception $e) {
+            $this->logger->logError(sprintf('Error resetting AUTO_INCREMENT: %s', $e->getMessage()));
+        }
+    }
+
+    /**
+     * Wysyła email z powiadomieniem o nieudanym imporcie zamówienia EMPIK.
+     *
+     * @param string $empikOrderId
+     * @param Exception $exception
+     */
+    protected function sendFailureNotification($empikOrderId, Exception $exception)
+    {
+        try {
+            $shopName = Configuration::get('PS_SHOP_NAME');
+            $subject = sprintf('[%s] Błąd importu zamówienia EMPIK: %s', $shopName, $empikOrderId);
+
+            $body = sprintf(
+                "Zamówienie EMPIK: %s\nData: %s\nBłąd: %s\n\nStack trace:\n%s",
+                $empikOrderId,
+                date('Y-m-d H:i:s'),
+                $exception->getMessage(),
+                $exception->getTraceAsString()
+            );
+
+            Mail::send(
+                (int) Configuration::get('PS_LANG_DEFAULT'),
+                'empik_import_error',
+                $subject,
+                [
+                    '{empik_order_id}' => $empikOrderId,
+                    '{error_message}' => $exception->getMessage(),
+                    '{error_date}' => date('Y-m-d H:i:s'),
+                    '{stack_trace}' => nl2br($exception->getTraceAsString()),
+                ],
+                self::ERROR_NOTIFICATION_EMAIL,
+                null,
+                Configuration::get('PS_SHOP_EMAIL'),
+                $shopName,
+                null,
+                null,
+                _PS_MODULE_DIR_ . 'empikmarketplace/mails/'
+            );
+        } catch (Exception $e) {
+            $this->logger->logError(sprintf('Error sending failure notification email: %s', $e->getMessage()));
         }
     }
 
diff --git a/modules/empikmarketplace/vendor/composer/platform_check.php b/modules/empikmarketplace/vendor/composer/platform_check.php
index 8b379f44..589e9e77 100644
--- a/modules/empikmarketplace/vendor/composer/platform_check.php
+++ b/modules/empikmarketplace/vendor/composer/platform_check.php
@@ -4,8 +4,8 @@
 
 $issues = array();
 
-if (!(PHP_VERSION_ID >= 50600)) {
-    $issues[] = 'Your Composer dependencies require a PHP version ">= 5.6.0". You are running ' . PHP_VERSION . '.';
+if (!(PHP_VERSION_ID >= 70200)) {
+    $issues[] = 'Your Composer dependencies require a PHP version ">= 7.2.0". You are running ' . PHP_VERSION . '.';
 }
 
 if ($issues) {