通过三方平台API 获取 union_id open_id

https://developers.weixin.qq.com/doc/oplatform/Third-party_Platforms/Official_Accounts/official_account_website_authorization.html

通过公众号网页授权 获取 union_id open_id

https://developers.weixin.qq.com/doc/offiaccount/OA_Web_Apps/Wechat_webpage_authorization.html

同一个公众号与三方平台，两种API获取的union_id 与 open_id 为什么不一致，业务上无法对应上数据