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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def fetch(self):
 """ Fetch a UserBindingInstance :returns: Fetched UserBindingInstance :rtype: twilio.rest.chat.v2.service.user.user_binding.UserBindingInstance """

        params = values.of({})

        payload = self._version.fetch(
            'GET',
            self._uri,
            params=params,
        )

        return UserBindingInstance(
            self._version,
            payload,
            service_sid=self._solution['service_sid'],
            user_sid=self._solution['user_sid'],
            sid=self._solution['sid'],
        )