Merge pull request #12 from WDI-Ideas/development

existing subscription validation 2

manage_subscriptions/views.py

@@ -429,7 +429,7 @@ def create_checkout_session(request):
     if has_active_principal_subscription(principal_id):
         print("Active principal subscription already exists.")
         messages.error(request, "Active principal subscription already exists")
-        return HttpResponseRedirect(success_url)
+        return redirect(success_url)
 
     try:
         subscription = Subscription.objects.get(id=subscription_id)