def fetch(self, ui_version=values.unset):
params = values.of({'<STR_LIT>': ui_version, })<EOL>payload = self._version.fetch(<EOL>'<STR_LIT:GET>',<EOL>self._uri,<EOL>params=params,<EOL>)<EOL>return ConfigurationInstance(self._version, payload, )<EOL>
Fetch a ConfigurationInstance

:param unicode ui_version: Pinned UI version

:returns: Fetched ConfigurationInstance
:rtype: twilio.rest.flex_api.v1.configuration.ConfigurationInstance