def get_instance(self, payload):
        """
        Build an instance of AuthTypeRegistrationsInstance

        :param dict payload: Payload response from the API

        :returns: twilio.rest.api.v2010.account.sip.domain.auth_types.auth_registrations_mapping.AuthTypeRegistrationsInstance
        :rtype: twilio.rest.api.v2010.account.sip.domain.auth_types.auth_registrations_mapping.AuthTypeRegistrationsInstance
        """
        return AuthTypeRegistrationsInstance(
            self._version,
            payload,
            account_sid=self._solution['account_sid'],
            domain_sid=self._solution['domain_sid'],
        )