diff --git a/app/Classes/Modules/Bookings/ControllersLogic/CreateBookingPaymentLogic.php b/app/Classes/Modules/Bookings/ControllersLogic/CreateBookingPaymentLogic.php
index e949c650..e0d49b0e 100644
--- a/app/Classes/Modules/Bookings/ControllersLogic/CreateBookingPaymentLogic.php
+++ b/app/Classes/Modules/Bookings/ControllersLogic/CreateBookingPaymentLogic.php
@@ -165,7 +165,7 @@ class CreateBookingPaymentLogic extends AbstractControllerLogic
             throw new MalformedRequestException('Your payment must not be greater than '. $outstanding .'.');
     }
 
-    private function handlePaymentMethods(Booking $booking, CalculationObject $configurations, string $billNumber, string $bankCode, string $email, string $paymentMethod): ?string
+    private function handlePaymentMethods(Booking $booking, CalculationObject $configurations, string $billNumber, ?string $bankCode, string $email, string $paymentMethod): ?string
     {
         $paymentReference = null;
 
@@ -178,7 +178,7 @@ class CreateBookingPaymentLogic extends AbstractControllerLogic
         return $paymentReference;
     }
 
-    private function handlePaymentGateway(Booking $booking, CalculationObject $configurations, string $billNumber, string $bankCode, string $email): string
+    private function handlePaymentGateway(Booking $booking, CalculationObject $configurations, string $billNumber, ?string $bankCode, string $email): string
     {
         $billPlzBill = $this->createsBillplzBill->execute(
             $booking->company->name,