MOL-1235: Fix voucher recognition in bundles

src/Service/MollieApi/OrderDataExtractor.php

@@ -9,6 +9,7 @@
 use Kiener\MolliePayments\Exception\OrderLineItemsNotFoundException;
 use Kiener\MolliePayments\Service\CustomerService;
 use Psr\Log\LoggerInterface;
+use Shopware\Core\Checkout\Cart\LineItem\LineItemCollection;
 use Shopware\Core\Checkout\Customer\CustomerEntity;
 use Shopware\Core\Checkout\Order\Aggregate\OrderCustomer\OrderCustomerEntity;
 use Shopware\Core\Checkout\Order\Aggregate\OrderDelivery\OrderDeliveryCollection;
@@ -140,6 +141,11 @@ public function extractDelivery(OrderEntity $orderEntity, Context $context): Ord
         return $delivery;
     }
 
+    /**
+     * @param OrderEntity $orderEntity
+     * @param Context $context
+     * @return OrderLineItemCollection
+     */
     public function extractLineItems(OrderEntity $orderEntity, Context $context): OrderLineItemCollection
     {
         $lineItems = $orderEntity->getLineItems();
@@ -152,6 +158,30 @@ public function extractLineItems(OrderEntity $orderEntity, Context $context): Or
             throw new OrderLineItemsNotFoundException($orderEntity->getId());
         }
 
-        return $lineItems;
+        # we have to build a flat list
+        # so that we also check nested items in bundles for instance
+        return new OrderLineItemCollection(
+            [
+                $this->buildFlat($lineItems)
+            ]
+        );
+    }
+
+    /**
+     * @param LineItemCollection $lineItems
+     * @return array
+     */
+    private function buildFlat(LineItemCollection $lineItems): array
+    {
+        $flat = [];
+        foreach ($lineItems as $lineItem) {
+            $flat[] = $lineItem;
+
+            foreach ($this->buildFlat($lineItem->getChildren()) as $nest) {
+                $flat[] = $nest;
+            }
+        }
+
+        return $flat;
     }
 }