diff --git a/Adyen/services/sessionAuthentication/session_authentication_api.py b/Adyen/services/sessionAuthentication/session_authentication_api.py
index 353be487..95af9bde 100644
--- a/Adyen/services/sessionAuthentication/session_authentication_api.py
+++ b/Adyen/services/sessionAuthentication/session_authentication_api.py
@@ -17,8 +17,7 @@ def create_authentication_session(self, request, idempotency_key=None, **kwargs)
         """
         Create a session token
         """
-        endpoint = self.baseUrl + "/sessions"
+        endpoint = self.baseUrl + f"/sessions"
         method = "POST"
-        return self.client.call_adyen_api(
-            request, self.service, method, endpoint, idempotency_key, **kwargs
-        )
+        return self.client.call_adyen_api(request, self.service, method, endpoint, idempotency_key, **kwargs)
+