diff --git a/rowers/views/paymentviews.py b/rowers/views/paymentviews.py
index 46462519..010b3cce 100644
--- a/rowers/views/paymentviews.py
+++ b/rowers/views/paymentviews.py
@@ -42,22 +42,19 @@ def rower_process_fakturoidcallback(request):
     base64_bytes = base64.b64encode(auth_string.encode('utf-8'))
     base64_string = base64_bytes.decode('utf-8')
 
-    authorizationstring = f"Basic {base64_string}"
+    authorizationstring = f"Basic {base64_bytes}"
 
     headers = {
         'User-Agent': f"{FAKTUROID_APP_NAME} ({FAKTUROID_EMAIL})",
         'Content-Type': 'application/json',
         'Accept': 'application/json',
-        'Authorization': authorizationstring,
+        'Authorization': 'Basic %s' % base64.b64encode(
+            bytes(auth_string, 'utf-8')).decode('utf-8'),
                }
 
-    base_url = 'https://app.fakturoid.cz/api/v3/oauth/token'
+    base_url = 'https://app.fakturoid.cz/api/v3/oauth/token/'
 
-    auth = HTTPBasicAuth(FAKTUROID_CLIENT_ID, FAKTUROID_CLIENT_SECRET)
-    client = BackendApplicationClient(client_id=FAKTUROID_CLIENT_ID)
-
-    oauth = OAuth2Session(client=client)
-    token = oauth.fetch_token(token_url=base_url, auth=auth)
+    response = requests.post(base_url, data=json.dumps(post_data), headers=headers)
 
     print(headers)
     print(post_data)