Fix #32 -- Add a PayPal webhook listener

src/pretix/plugins/paypal/urls.py

@@ -1,10 +1,17 @@
 from django.conf.urls import include, url
 
-from .views import abort, success
+from .views import abort, refund, success, webhook
 
 event_patterns = [
     url(r'^paypal/', include([
         url(r'^abort/$', abort, name='abort'),
         url(r'^return/$', success, name='return'),
+        url(r'^webhook/$', webhook, name='webhook'),
     ])),
 ]
+
+
+urlpatterns = [
+    url(r'^control/event/(?P<organizer>[^/]+)/(?P<event>[^/]+)/paypal/refund/(?P<id>\d+)/',
+        refund, name='refund'),
+]