class Doorkeeper::OAuth::RefreshTokenRequest

def initialize(server, refresh_token, credentials, parameters = {})
  @server          = server
  @refresh_token   = refresh_token
  @credentials     = credentials
  @original_scopes = parameters[:scope] || parameters[:scopes]
  @refresh_token_parameter = parameters[:refresh_token]
  if credentials
    @client = Application.by_uid_and_secret credentials.uid,
                                            credentials.secret
  end
end