ACP2E-3647: [CLOUD]: GraphQl error Internal server error placeOrder mutation

Author: soklymeach

app/code/Magento/SalesGraphQl/Model/Resolver/OrderTotal.php

@@ -1,7 +1,7 @@
 <?php
 /**
- * Copyright © Magento, Inc. All rights reserved.
- * See COPYING.txt for license details.
+ * Copyright 2019 Adobe
+ * All Rights Reserved.
  */
 declare(strict_types=1);
 
@@ -125,7 +125,8 @@ private function getDiscountDetails(OrderInterface $order): array
                 'amount' => [
                     'value' => abs((float) $order->getDiscountAmount()),
                     'currency' => $order->getOrderCurrencyCode()
-                ]
+                ],
+                'order_model' => $order
             ];
         }
         return $orderDiscounts;

app/code/Magento/SalesRuleGraphQl/Model/Resolver/Coupon.php

@@ -33,6 +33,9 @@ public function __construct(
      */
     public function resolve(Field $field, $context, ResolveInfo $info, ?array $value = null, ?array $args = null)
     {
+        if(isset($value['order_model'])) {
+            return ['code' => $value['order_model']->getCouponCode()];
+        }
         if (!isset($value['discount_model'])) {
             throw new LocalizedException(__('"discount_model" value should be specified'));
         }