def get_records(self, start_time, end_time, msgid=1,
                    number=10000):
        """
        获取客服聊天记录

        :param start_time: 查询开始时间，UNIX 时间戳
        :param end_time: 查询结束时间，UNIX 时间戳，每次查询不能跨日查询
        :param msgid: 消息id顺序从小到大，从1开始
        :param number: 每次获取条数，最多10000条

        :return: 返回的 JSON 数据包
        """
        if isinstance(start_time, datetime.datetime):
            start_time = time.mktime(start_time.timetuple())
        if isinstance(end_time, datetime.datetime):
            end_time = time.mktime(end_time.timetuple())
        record_data = {
            'starttime': int(start_time),
            'endtime': int(end_time),
            'msgid': msgid,
            'number': number
        }
        res = self._post(
            'https://api.weixin.qq.com/customservice/msgrecord/getmsglist',
            data=record_data,
        )
        return res