code: def fetch(self, ui_version=values.unset):
          
          params = values.of({'UiVersion': ui_version, })
  
          payload = self._version.fetch(
              'GET',
              self._uri,
              params=params,
          )
  
          return ConfigurationInstance(self._version, payload, )
docs: Fetch a ConfigurationInstance
  
          :param unicode ui_version: Pinned UI version
  
          :returns: Fetched ConfigurationInstance
          :rtype: twilio.rest.flex_api.v1.configuration.ConfigurationInstance