Icons for payment methods

app/EventPaymentModules/Modules/UndefinedPaymentModule.php

@@ -29,6 +29,7 @@ class UndefinedPaymentModule extends AbstractEventPaymentModule
     {
         return [
             ['name' => 'payment_information', 'label' => 'Zahlungsinformationen', 'type' => 'richtext', 'required' => true],
+            ['name' => 'icon', 'label' => 'Symbol', 'type' => 'icon', 'required' => false],
         ];
     }