def configuration(self):
        """
        :rtype: twilio.rest.flex_api.v1.configuration.ConfigurationList
        """
        if self._configuration is None:
            self._configuration = ConfigurationList(self)
        return self._configuration
def configuration ( self ) : if self . _configuration is None : self . _configuration = ConfigurationList ( self ) return self . _configuration
:rtype: twilio.rest.flex_api.v1.configuration.ConfigurationList