The OAuth getting started doc does not provide details of the payload you get back when requesting the token.
Everything is OAuth 2 spec. RFC 6749 - The OAuth 2.0 Authorization Framework
Thanks @bradb. I know, but my point was you do not provide the information. You can imrove the docs by providing at least a link to the RFC.
Also I. like others, am calling your API from a ‘confidential’ server so there is no user and we want to use the Client Credentials Grant where we get an access token from you for our app in advance. As it is we have to hack a Authorization Code Grant web app just to get the user access token and then use that with constant token refreshs. Another hack is to sniff the network traffic when authenticating for the interactive docs. Neither are good.