code: def update(self, notification_level):
          
          data = values.of({'NotificationLevel': notification_level, })
  
          payload = self._version.update(
              'POST',
              self._uri,
              data=data,
          )
  
          return UserChannelInstance(
              self._version,
              payload,
              service_sid=self._solution['service_sid'],
              user_sid=self._solution['user_sid'],
              channel_sid=self._solution['channel_sid'],
          )
docs: Update the UserChannelInstance
  
          :param UserChannelInstance.NotificationLevel notification_level: The push notification level to assign to the User Channel
  
          :returns: Updated UserChannelInstance
          :rtype: twilio.rest.chat.v2.service.user.user_channel.UserChannelInstance