def activate_membercard(self, membership_number, code, **kwargs):
kwargs['<STR_LIT>'] = membership_number<EOL>kwargs['<STR_LIT:code>'] = code<EOL>return self._post(<EOL>'<STR_LIT>',<EOL>data=kwargs<EOL>)<EOL>
激活会员卡 - 接口激活方式
详情请参见
https://mp.weixin.qq.com/wiki?t=resource/res_main&id=mp1451025283

参数示例：
{
    "init_bonus": 100,
    "init_bonus_record":"旧积分同步",
    "init_balance": 200,
    "membership_number": "AAA00000001",
    "code": "12312313",
    "card_id": "xxxx_card_id",
    "background_pic_url": "https://mmbiz.qlogo.cn/mmbiz/0?wx_fmt=jpeg",
    "init_custom_field_value1": "xxxxx",
    "init_custom_field_value2": "xxxxx",
    "init_custom_field_value3": "xxxxx"
}

返回示例：
{"errcode":0,   "errmsg":"ok"}

:param membership_number: 必填，会员卡编号，由开发者填入，作为序列号显示在用户的卡包里。可与Code码保持等值
:param code: 必填，领取会员卡用户获得的code
:param kwargs: 其他非必填字段，包含则更新对应字段。详情参见微信文档 “6 激活会员卡” 部分
:return: 参见返回示例