Error in Generating Access token

{“status”: “failure”, “code”: 11, “data”: null, “message”: “API method not found.”}
I am getting this error after trying to generate the token from the postman app. where am i going wrong?

Make sure you are using the correct URL.
Try going through these.
https://developers.pinterest.com/tools/api-explorer/?
https://developers.pinterest.com/docs/api/overview/?