Issue #3119674 by Berdir: Payment methods without expiration date like twint...

Issue #3119674 by Berdir: Payment methods without expiration date like twint result in an error when saving alias

src/Plugin/Commerce/PaymentGateway/Datatrans.php

@@ -402,9 +402,11 @@ class Datatrans extends OffsitePaymentGatewayBase {
       'expy' => $payment_details['expy'],
     ]);
 
-    $expires = CreditCard::calculateExpirationTimestamp($payment_details['expm'], $payment_details['expy']);
     $payment_method->setRemoteId($payment_details['aliasCC']);
-    $payment_method->setExpiresTime($expires);
+    if (!empty($payment_details['expm']) && !empty($payment_details['expy'])) {
+      $expires = CreditCard::calculateExpirationTimestamp($payment_details['expm'], $payment_details['expy']);
+      $payment_method->setExpiresTime($expires);
+    }
     $payment_method->save();
     return $payment_method;
   }