- Removed abstract method

- Changed check to === null
- Added null to doc comments for $type parameter.

Author: dverkade

app/code/Magento/Vault/Api/Data/PaymentTokenFactoryInterface.php

@@ -21,7 +21,7 @@ interface PaymentTokenFactoryInterface
 
     /**
      * Create payment token entity
-     * @param $type string
+     * @param $type string|null
      * @return PaymentTokenInterface
      */
     public function create($type = null);

app/code/Magento/Vault/Model/AbstractPaymentTokenFactory.php

@@ -36,7 +36,7 @@ public function __construct(
         ObjectManagerInterface $objectManager,
         PaymentTokenFactoryInterface $paymentTokenFactory = null
     ) {
-        if (!$paymentTokenFactory) {
+        if ($paymentTokenFactory === null) {
             $paymentTokenFactory = $objectManager->get(PaymentTokenFactoryInterface::class);
         }
 
@@ -52,9 +52,4 @@ public function create()
     {
         return $this->paymentTokenFactory->create($this->getType());
     }
-
-    /**
-     * @return string
-     */
-    abstract public function getType();
 }