Added RestAPI compatibility with methods such as Apple Pay

Webapi/StartTransaction.php

@@ -10,6 +10,7 @@
 use Magento\Sales\Api\OrderRepositoryInterface;
 use Mollie\Payment\Api\PaymentTokenRepositoryInterface;
 use Mollie\Payment\Api\Webapi\StartTransactionRequestInterface;
+use Mollie\Payment\Service\Order\Transaction;
 
 class StartTransaction implements StartTransactionRequestInterface
 {
@@ -23,12 +24,19 @@ class StartTransaction implements StartTransactionRequestInterface
      */
     private $paymentTokenRepository;
 
+    /**
+     * @var Transaction
+     */
+    private $transaction;
+
     public function __construct(
         OrderRepositoryInterface $orderRepository,
-        PaymentTokenRepositoryInterface $paymentTokenRepository
+        PaymentTokenRepositoryInterface $paymentTokenRepository,
+        Transaction $transaction
     ) {
         $this->orderRepository = $orderRepository;
         $this->paymentTokenRepository = $paymentTokenRepository;
+        $this->transaction = $transaction;
     }
 
     /**
@@ -45,6 +53,16 @@ public function execute(string $token)
         /** @var \Mollie\Payment\Model\Mollie $instance */
         $instance = $order->getPayment()->getMethodInstance();
 
-        return $instance->startTransaction($order);
+        $checkoutUrl = $instance->startTransaction($order);
+        if ($checkoutUrl !== null) {
+            return $checkoutUrl;
+        }
+
+        // If the order is paid with a payment method without hosted payment page,
+        // we need to redirect to the success page. As the order is instantly paid.
+        return $this->transaction->getRedirectUrl(
+            $order,
+            $token
+        );
     }
 }