code: def add_multiple(self, *users):
          
          guid = uuid.uuid4()
          for i, user_ in enumerate(users):
              user_['guid'] = '{}-{}'.format(guid, i)
  
          payload = {'members': users}
          url = utils.urljoin(self.url, 'add')
          response = self.session.post(url, json=payload)
          return MembershipRequest(self, *users, group_id=self.group_id,
                                   **response.data)
docs: Add multiple users to the group at once.
  
          Each given user must be a dictionary containing a nickname and either
          an email, phone number, or user_id.
  
          :param args users: the users to add
          :return: a membership request
          :rtype: :class:`MembershipRequest`