ads_common/lib/ads_common/api.rb
def save_oauth2_token(token)
      raise AdsCommon::Errors::Error, "Can't save nil token" if token.nil?
      AdsCommon::Utils.save_oauth2_token(
          File.join(ENV['HOME'], api_config.default_config_filename), token)
    end
def save_oauth2_token(token)
      raise AdsCommon::Errors::Error, "Can't save nil token" if token.nil?
      AdsCommon::Utils.save_oauth2_token(
          File.join(ENV['HOME'], api_config.default_config_filename), token)
    end
Updates default configuration file to include OAuth2 token information.