Add a dummy Stripe plugin for testing purposes

src/pretix/plugins/stripe/signals.py

@@ -0,0 +1,10 @@
+from django.dispatch import receiver
+
+from pretix.base.signals import register_payment_providers
+
+from .payment import Stripe
+
+
+@receiver(register_payment_providers)
+def register_payment_provider(sender, **kwargs):
+    return Stripe