# File lib/oauth2/access_token.rb, line 5
    def initialize(client, token, refresh_token = nil, expires_in = nil)
      @client = client
      @token = token
      @refresh_token = refresh_token
      @expires_in = (expires_in.nil? || expires_in == '') ? nil : expires_in.to_i
      @expires_at = Time.now + @expires_in if @expires_in
    end