Basic implementation of payment methods

app/Domains/Event/Actions/SignUp/SignUpRequest.php

@@ -44,7 +44,8 @@ class SignUpRequest {
         public int $arrival_eating,
         public int $departure_eating,
         public ?string $notes,
-        public Amount $amount
+        public Amount $amount,
+        public ?string $paymentMethod,
     ) {
     }
 }