MC-41638: [Paypal Express Checkout] Can't place an order

Author: zakdma

app/code/Magento/Paypal/Controller/Express/GetTokenData.php

@@ -76,7 +76,7 @@ class GetTokenData extends AbstractExpress implements HttpGetActionInterface
     private $guestCartRepository;
 
     /**
-     * @var UserContextInterface
+     * @var UserContextInterface|null
      */
     private $userContext;
 
@@ -109,7 +109,7 @@ public function __construct(
         CustomerRepository $customerRepository,
         CartRepositoryInterface $cartRepository,
         GuestCartRepositoryInterface $guestCartRepository,
-        UserContextInterface $userContext
+        UserContextInterface $userContext = null
     ) {
         parent::__construct(
             $context,
@@ -162,9 +162,32 @@ public function execute(): ResultInterface
             $responseContent['error_message'] = __('Sorry, but something went wrong');
         }
 
+        if (!$responseContent['success']) {
+            $this->messageManager->addErrorMessage($responseContent['error_message']);
+        }
+
         return $controllerResult->setData($responseContent);
     }
 
+    /**
+     * Prepare quote specified for checkout.
+     *
+     * @return \Magento\Quote\Api\Data\CartInterface
+     * @throws LocalizedException
+     */
+    private function prepareQuote()
+    {
+        $quoteId = $this->getRequest()->getParam('quote_id');
+        if ($quoteId) {
+            $quote = $this->userContext->getUserId()
+                ? $this->cartRepository->get($quoteId)
+                : $this->guestCartRepository->get($quoteId);
+            if ((int)$quote->getCustomer()->getId() === (int)$this->userContext->getUserId()) {
+                return $quote;
+            }
+        }
+        return $this->_getQuote();
+    }
     /**
      * Get paypal token
      *
@@ -173,7 +196,7 @@ public function execute(): ResultInterface
      */
     private function getToken(): ?string
     {
-        $quote = $this->_getQuote();
+        $quote = $this->prepareQuote();
         $this->_initCheckout($quote);
 
         if ($quote->getIsMultiShipping()) {