code: def update(self, auth_payload=values.unset):
          
          return self._proxy.update(auth_payload=auth_payload, )
docs: Update the ChallengeInstance
  
          :param unicode auth_payload: Optional payload to verify the Challenge
  
          :returns: Updated ChallengeInstance
          :rtype: twilio.rest.authy.v1.service.entity.factor.challenge.ChallengeInstance