diff --git a/override/classes/Cart.php b/override/classes/Cart.php
index 3de47ea9..2514b960 100755
--- a/override/classes/Cart.php
+++ b/override/classes/Cart.php
@@ -839,6 +839,13 @@ class Cart extends CartCore {
 
         if (!$order_total)
              return Tools::displayError('Cannot add voucher if order is free.');
+        
+        // Ony for API (application)
+        $subdomain = substr($_SERVER['HTTP_HOST'], 0, strpos($_SERVER['HTTP_HOST'], '.'));
+        if ($subdomain != 'api' && $discountObj->appli == 1) {
+            return Tools::displayError('This voucher is not valid');
+        }
+             
         if (!$discountObj->active)
             return Tools::displayError('This voucher has already been used or is disabled.');
         if (!$discountObj->quantity)