code: def get_instance(self, payload):
          
          return ChallengeInstance(
              self._version,
              payload,
              service_sid=self._solution['service_sid'],
              identity=self._solution['identity'],
              factor_sid=self._solution['factor_sid'],
          )
docs: Build an instance of ChallengeInstance
  
          :param dict payload: Payload response from the API
  
          :returns: twilio.rest.authy.v1.service.entity.factor.challenge.ChallengeInstance
          :rtype: twilio.rest.authy.v1.service.entity.factor.challenge.ChallengeInstance