Persistent "Redirect URI mismatch" error

When making the POST request to obtain the access and refresh tokens, I keep receiving a 403 status code, with the “Redirect URI mismatch” error.

{“reason”:“Invalid request : Redirect URI mismatch.”,“error”:“invalid_request”}

Which App Type (OAuth / Chatbot / JWT / Webhook)?

Which Endpoint/s?

Additional context
I’m stuck at step 2 of OAuth2 authorization. I have obtained the authorization code from step 1, and now I’m calling the endpoint for step 2:[AUTHORIZATION_CODE]&

Where [AUTHORIZATION_CODE] is of course the code obtained on step 1.

In my app, I have set the callback URL as, and I have added both and to the URL whitelist, but I keep getting the same error over and over again.

Am I missing something?

Solved it. Turns out that the return URL was having a parameter appended, so removing it solved the problem

Happy to hear you resolved the issue! :slight_smile: