first attempt at process_webhook

rowers/views/paymentviews.py

@@ -8,7 +8,10 @@ from rowers.views.statements import *
 @csrf_exempt
 def braintree_webhook_view(request):
     if request.method == 'POST':
-        braintreestuff.webhook(request)
+        result = braintreestuff.webhook(request)
+        if result == 4:
+            raise PermissionDenied("Not allowed")
+        
     return HttpResponse('')
 
 def paidplans_view(request):