PKB responds with the access token in JSON. Note that a refresh token is never provided from a Client Credentials Grant workflow; when your access token expires you can repeat the Client Credentials Grant workflow to obtain a new one.
This is the access token that can subsequently be used to authenticate against the relevant API, and gain access to the functionality
This is always "bearer"
This indicates the number of seconds for which the access_token is valid
Currently, scopes are not supported. As such, this will always be "none".