In order to get additional information about the authorized user, as a developer I need a way to access additional fields in the token response.

[dmfs]

Some services (i.e. Dropbox: https://www.dropbox.com/developers-v1/core/docs#oauth2-methods) return additional fields in the token response in order to give a client a user identifier.

At present there is no clean way to access these fields.

[dmfs]

done