def __init__(self, version, payload, service_sid, identity, factor_sid,<EOL>sid=None):
super(ChallengeInstance, self).__init__(version)<EOL>self._properties = {<EOL>'<STR_LIT>': payload['<STR_LIT>'],<EOL>'<STR_LIT>': payload['<STR_LIT>'],<EOL>'<STR_LIT>': payload['<STR_LIT>'],<EOL>'<STR_LIT>': payload['<STR_LIT>'],<EOL>'<STR_LIT>': payload['<STR_LIT>'],<EOL>'<STR_LIT>': payload['<STR_LIT>'],<EOL>'<STR_LIT>': deserialize.iso8601_datetime(payload['<STR_LIT>']),<EOL>'<STR_LIT>': deserialize.iso8601_datetime(payload['<STR_LIT>']),<EOL>'<STR_LIT>': deserialize.iso8601_datetime(payload['<STR_LIT>']),<EOL>'<STR_LIT>': deserialize.iso8601_datetime(payload['<STR_LIT>']),<EOL>'<STR_LIT:status>': payload['<STR_LIT:status>'],<EOL>'<STR_LIT>': payload['<STR_LIT>'],<EOL>'<STR_LIT>': payload['<STR_LIT>'],<EOL>'<STR_LIT>': payload['<STR_LIT>'],<EOL>'<STR_LIT>': payload['<STR_LIT>'],<EOL>'<STR_LIT>': payload['<STR_LIT>'],<EOL>'<STR_LIT:url>': payload['<STR_LIT:url>'],<EOL>}<EOL>self._context = None<EOL>self._solution = {<EOL>'<STR_LIT>': service_sid,<EOL>'<STR_LIT>': identity,<EOL>'<STR_LIT>': factor_sid,<EOL>'<STR_LIT>': sid or self._properties['<STR_LIT>'],<EOL>}<EOL>
Initialize the ChallengeInstance

:returns: twilio.rest.authy.v1.service.entity.factor.challenge.ChallengeInstance
:rtype: twilio.rest.authy.v1.service.entity.factor.challenge.ChallengeInstance