I have tried requesting the access token via both the Postman library found here: https://devcommunity.ringcentral.com/ringcentraldev/topics/postman-collection
as well as via a CURL request. In each case I get a different error but still cannot generate an access token.
I am using my Client ID and Client Secret found under the credentials area (Are these right?).
Any who,
CURL Request:
curl -X POST "