diff --git a/assets/products/PROVA.png b/assets/products/PROVA.png
new file mode 100644
index 0000000..8a267f8
Binary files /dev/null and b/assets/products/PROVA.png differ
diff --git a/checkout/common.php b/checkout/common.php
index 8a64281..1009df0 100644
--- a/checkout/common.php
+++ b/checkout/common.php
@@ -295,6 +295,78 @@ function kapvoe_create_checkout_session(array $config, array $payload): array {
     return $decoded;
 }
 
+function kapvoe_decrement_sheet_stock(array $config, array $order, string $sessionId): array
+{
+    $url = (string)($config['stock_sync_url'] ?? '');
+    $token = (string)($config['stock_sync_token'] ?? '');
+
+    if ($url === '' || $token === '') {
+        throw new RuntimeException('Falta configurar stock_sync_url o stock_sync_token');
+    }
+
+    $payload = [
+        'action' => 'decrement_stock',
+        'token' => $token,
+        'product_code' => (string)($order['product_code'] ?? ''),
+        'quantity' => max(1, (int)($order['quantity'] ?? 1)),
+        'order_id' => (string)($order['order_id'] ?? ''),
+        'session_id' => $sessionId,
+    ];
+
+    if ($payload['product_code'] === '') {
+        throw new RuntimeException('La comanda no té product_code');
+    }
+
+    if ($payload['order_id'] === '') {
+        throw new RuntimeException('La comanda no té order_id');
+    }
+
+    if (!function_exists('curl_init')) {
+        throw new RuntimeException('cURL no està disponible al PHP');
+    }
+
+    $ch = curl_init($url);
+
+    curl_setopt_array($ch, [
+        CURLOPT_RETURNTRANSFER => true,
+        CURLOPT_POST => true,
+        CURLOPT_POSTFIELDS => json_encode($payload, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES),
+        CURLOPT_HTTPHEADER => [
+            'Content-Type: application/json',
+            'Accept: application/json',
+        ],
+        CURLOPT_TIMEOUT => 20,
+        CURLOPT_CONNECTTIMEOUT => 10,
+    ]);
+
+    $response = curl_exec($ch);
+
+    if ($response === false) {
+        $error = curl_error($ch);
+        curl_close($ch);
+        throw new RuntimeException("Error cURL stock sync: {$error}");
+    }
+
+    $statusCode = (int)curl_getinfo($ch, CURLINFO_HTTP_CODE);
+    curl_close($ch);
+
+    if ($statusCode < 200 || $statusCode >= 300) {
+        throw new RuntimeException("Stock sync HTTP {$statusCode}: {$response}");
+    }
+
+    $json = json_decode($response, true);
+
+    if (!is_array($json)) {
+        throw new RuntimeException('Resposta no JSON del stock sync: ' . $response);
+    }
+
+    if (!($json['ok'] ?? false)) {
+        throw new RuntimeException('Stock sync error: ' . ($json['error'] ?? 'error desconegut'));
+    }
+
+    return $json;
+}
+
 function kapvoe_verify_stripe_signature(string $payload, string $header, string $secret, int $tolerance = 300): bool {
     if (!$header || !$secret) {
         return false;
diff --git a/checkout/config.php b/checkout/config.php
index 42a1567..18345b0 100644
--- a/checkout/config.php
+++ b/checkout/config.php
@@ -3,10 +3,10 @@ declare(strict_types=1);
 
 return [
     // Clau secreta real de Stripe. NO la posis mai al HTML.
-    'stripe_secret_key' => 'sk_test_51IvGaFHRV8rA2XwsDiGII0rVfot2HabnvF862L8G6rYIzUscZDMkM4WlVAV6GbYSMZsFEDF44PEppdJaLdGo0idB00UyabGh0u',
+    'stripe_secret_key' => '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',
 
     // Secret del webhook de Stripe (Signing secret)
-    'stripe_webhook_secret' => 'whsec_wBJZjwPIhPclM1i4bKUtnQqol26caq5L',
+    'stripe_webhook_secret' => 'whsec_8FTXIXPWBSzFjJNQWuzetQF6LoNKv9sg',
 
     // Moneda
     'currency' => 'eur',
@@ -17,4 +17,7 @@ return [
     // URLs públiques
     'success_url' => 'https://kapvoe-portfoli.treblarella.org/checkout/payment-success.php',
     'cancel_url' => 'https://kapvoe-portfoli.treblarella.org/checkout/payment-cancel.php',
+    
+    'stock_sync_url' => 'https://script.google.com/macros/s/AKfycbyH6PuQPR342mwSiKCkYZ1lOnn1VccqzFO-ScbhwjvJoABU3LqVNJcS3gtPE5ZuT0JyvQ/exec',
+    'stock_sync_token' => 'kapvoe_stock_2026_x7F9mQpL2vN8rT4sZ1kW',
 ];
diff --git a/checkout/stripe-webhook.php b/checkout/stripe-webhook.php
index 79254e9..b4791fd 100644
--- a/checkout/stripe-webhook.php
+++ b/checkout/stripe-webhook.php
@@ -69,8 +69,15 @@ try {
             }
 
             $alreadyUpdated = (string)($order['stock_updated'] ?? '') === '1';
+            $stockResult = null;
 
             if ($paymentStatus === 'paid' && !$alreadyUpdated) {
+                $stockResult = kapvoe_decrement_sheet_stock($config, $order, $sessionId);
+
+                if (!($stockResult['ok'] ?? false)) {
+                    throw new RuntimeException('No s\'ha pogut actualitzar l\'stock al Google Sheet');
+                }
+
                 kapvoe_mark_order_stock_updated($config, $sessionId);
                 $alreadyUpdated = true;
             }
@@ -82,7 +89,8 @@ try {
                 'handled' => $type,
                 'session_id' => $sessionId,
                 'payment_intent_id' => $paymentIntentId,
-                'already_updated' => $alreadyUpdated
+                'already_updated' => $alreadyUpdated,
+                'stock_result' => $stockResult
             ], JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
             exit;
 
@@ -103,4 +111,4 @@ try {
         'error' => $e->getMessage()
     ], JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
     exit;
-}
+}
\ No newline at end of file