Getting this error when trying to connect using Sandbox credentials. “API Sandbox does not support OAuth, use sandbox access token instead”. Based on the docs, it seems like it’s trying to connect to the legacy Sandbox instead of v2 Sandbox. Does the Sandbox version depend on the API Version? We’re currently on API Version 2019-09-25.
Hm, that definitely does sound like a legacy sandbox issue. Are you trying to go through the OAuth authorize endpoint, or is this calling ObtainToken? I don’t believe either require an access token though so I’m not completely sure what it means. Please clarify what exactly you’re doing so I can see if I can replicate.
Thanks for providing that - I think I see the issue. The url should be squareupsandbox.com... instead of squareup.com.... Try that and let me know if you still receive an error.