There are several changes to the latest OAuth 2.0 spec which requires a couple of changes to 2 models which you are REQUIRED to update manually if you are supporting OAuth2. github.com/pelle/oauth-plugin/blob/master/lib/generators/active_record/oauth_provider_templates/oauth2_token.rb class Oauth2Token < AccessToken attr_accessor :state def as_json(options={}) d = {:access_token=>token, :token_typ