diff --git a/server/registration/mutations_public.py b/server/registration/mutations_public.py
index 6b5c7605..2cd26c9c 100644
--- a/server/registration/mutations_public.py
+++ b/server/registration/mutations_public.py
@@ -36,6 +36,9 @@ class Registration(relay.ClientIDMutation):
         try:
             hep_client.customer_activate(confirmation_key, user_id)
             user_data = hep_client.customers_by_id(admin_token, user_id)
+
+            # double check if user has verified his email. If the "confirmation" field is present, the email address
+            # is not verified. Note that the user should not be able to see this page without verified email.
             if 'confirmation' in user_data:
                 return cls.return_registration_msg('invalid_key')
         except HepClientException:
@@ -53,7 +56,7 @@ class Registration(relay.ClientIDMutation):
 
     @classmethod
     def return_registration_msg(cls, message):
-        # even if the user has no valid license treat it like a success
+        # even if the user has no valid license on the hep server treat it like a success as registration has succeeded
         if message == UNKNOWN_ERROR:
             raise Exception(message)
 
diff --git a/server/registration/tests/test_registration_proxy.py b/server/registration/tests/test_registration_proxy.py
index d8d3b0f5..36e1ca8c 100644
--- a/server/registration/tests/test_registration_proxy.py
+++ b/server/registration/tests/test_registration_proxy.py
@@ -74,7 +74,7 @@ class ProxyTest(TestCase):
     @patch.object(HepClient, 'customer_create', return_value=RESPONSE)
     def test_proxy_filters_confirmation_key(self, create_mock):
 
-        response = self.client.post(reverse('api:registration:proxy'), DATA)
+        response = self.client.post(reverse('api:registration:proxy'), json.dumps(DATA), content_type="application/json")
         found = 'confirmation' in response.json().keys()
         self.assertFalse(found)
 
@@ -82,5 +82,5 @@ class ProxyTest(TestCase):
       data={'message': 'Ein Kunde mit der gleichen E-Mail-Adresse existiert bereits in einer zugeordneten Website.'}))
     def test_handles_400(self, create_mock):
 
-        response = self.client.post(reverse('api:registration:proxy'), DATA)
+        response = self.client.post(reverse('api:registration:proxy'), json.dumps(DATA), content_type="application/json")
         self.assertEquals(response.json()['message'], 'Ein Kunde mit der gleichen E-Mail-Adresse existiert bereits in einer zugeordneten Website.')
diff --git a/server/registration/view.py b/server/registration/view.py
index 19db6b1a..433b7e24 100644
--- a/server/registration/view.py
+++ b/server/registration/view.py
@@ -19,11 +19,7 @@ class RegistrationProxyView(View):
 
     def post(self, request, *args, **kwargs):
         hep_client = HepClient()
-
-        if request.POST:
-            data = request.POST
-        else:
-            data = json.loads(request.body)
+        data = json.loads(request.body)
 
         try:
             hep_data = hep_client.customer_create(data)
diff --git a/server/users/models.py b/server/users/models.py
index bd435216..6da15944 100644
--- a/server/users/models.py
+++ b/server/users/models.py
@@ -225,4 +225,4 @@ class License(models.Model):
                                            self.for_role.key)
 
     def __str__(self):
-        return 'License for role: %s' % self.for_role
+        return f'License for role: {self.for_role}'