code: def get(self, sid):
          
          return AuthRegistrationsCredentialListMappingContext(
              self._version,
              account_sid=self._solution['account_sid'],
              domain_sid=self._solution['domain_sid'],
              sid=sid,
          )
docs: Constructs a AuthRegistrationsCredentialListMappingContext
  
          :param sid: The unique string that identifies the resource
  
          :returns: twilio.rest.api.v2010.account.sip.domain.auth_types.auth_registrations_mapping.auth_registrations_credential_list_mapping.AuthRegistrationsCredentialListMappingContext
          :rtype: twilio.rest.api.v2010.account.sip.domain.auth_types.auth_registrations_mapping.auth_registrations_credential_list_mapping.AuthRegistrationsCredentialListMappingContext