diff --git a/.vscode/ftp-kr.sync.cache.json b/.vscode/ftp-kr.sync.cache.json
index fad2102..45c5d91 100644
--- a/.vscode/ftp-kr.sync.cache.json
+++ b/.vscode/ftp-kr.sync.cache.json
@@ -9,8 +9,8 @@
       },
       "api.php": {
         "type": "-",
-        "size": 18156,
-        "lmtime": 1773088345243,
+        "size": 19666,
+        "lmtime": 1773184004748,
         "modified": false
       },
       "autoload": {
@@ -302,8 +302,8 @@
       "docs": {
         "api-public-product-management.md": {
           "type": "-",
-          "size": 12452,
-          "lmtime": 1773088360435,
+          "size": 13629,
+          "lmtime": 1773184070257,
           "modified": false
         },
         "class-methods.md": {
diff --git a/api.php b/api.php
index 5316ed8..8d2a9cd 100644
--- a/api.php
+++ b/api.php
@@ -58,7 +58,7 @@ function api_validate_api_key( $mdb )
 function api_get_product_by_offer_and_client( $mdb, $offer_id, $client_id )
 {
   return $mdb -> query(
-    'SELECT p.id, p.name, p.title, p.google_product_category, p.custom_label_4
+    'SELECT p.id, p.name, p.title, p.google_product_category, p.custom_label_3, p.custom_label_4
      FROM products p
      JOIN clients cl ON p.client_id = cl.id
      WHERE p.offer_id = :offer_id
@@ -198,6 +198,74 @@ if ( \S::get( 'action' ) == 'campaign_comment_add' )
   exit;
 }
 
+// Zmiana custom_label_3 dla produktu przez API
+if ( \S::get( 'action' ) == 'product_custom_label_3_set' )
+{
+  api_validate_api_key( $mdb );
+
+  $offer_id        = trim( (string) \S::get( 'offer_id' ) );
+  $client_id_param = (int) \S::get( 'client_id' );
+  $custom_label_3  = trim( (string) ( \S::get( 'custom_label_3' ) ?? \S::get( 'value' ) ?? '' ) );
+
+  if ( $offer_id === '' || $client_id_param <= 0 )
+  {
+    api_json_response( [ 'result' => 'error', 'message' => 'Missing required params: offer_id, client_id' ], 422 );
+  }
+
+  $product = api_get_product_by_offer_and_client( $mdb, $offer_id, $client_id_param );
+
+  if ( !$product )
+  {
+    api_json_response( [ 'result' => 'error', 'message' => 'Product not found' ], 404 );
+  }
+
+  $update_result = \factory\Products::set_product_data( (int) $product['id'], 'custom_label_3', $custom_label_3 );
+
+  if ( !$update_result )
+  {
+    api_json_response( [ 'result' => 'error', 'message' => 'Failed to update custom_label_3' ], 500 );
+  }
+
+  \factory\Products::add_product_comment( (int) $product['id'], 'Zmiana etykiety 3 na: ' . ( $custom_label_3 !== '' ? $custom_label_3 : '(puste)' ) . ' (API)' );
+
+  api_json_response( [
+    'result' => 'ok',
+    'product_id' => (int) $product['id'],
+    'offer_id' => $offer_id,
+    'client_id' => $client_id_param,
+    'custom_label_3' => $custom_label_3
+  ] );
+}
+
+// Odczyt custom_label_3 dla produktu przez API
+if ( \S::get( 'action' ) == 'product_custom_label_3_get' )
+{
+  api_validate_api_key( $mdb );
+
+  $offer_id        = trim( (string) \S::get( 'offer_id' ) );
+  $client_id_param = (int) \S::get( 'client_id' );
+
+  if ( $offer_id === '' || $client_id_param <= 0 )
+  {
+    api_json_response( [ 'result' => 'error', 'message' => 'Missing required params: offer_id, client_id' ], 422 );
+  }
+
+  $product = api_get_product_by_offer_and_client( $mdb, $offer_id, $client_id_param );
+
+  if ( !$product )
+  {
+    api_json_response( [ 'result' => 'error', 'message' => 'Product not found' ], 404 );
+  }
+
+  api_json_response( [
+    'result' => 'ok',
+    'product_id' => (int) $product['id'],
+    'offer_id' => $offer_id,
+    'client_id' => $client_id_param,
+    'custom_label_3' => trim( (string) ( $product['custom_label_3'] ?? '' ) )
+  ] );
+}
+
 // Zmiana custom_label_4 dla produktu przez API
 if ( \S::get( 'action' ) == 'product_custom_label_4_set' )
 {