1、微信官方文档,服务端统一消息接口(优先发送小程序模板消息,然后是公众号模板消息)
https://developers.weixin.qq.com/miniprogram/dev/api-backend/open-api/uniform-message/uniformMessage.send.html
2、小程序订阅消息文档
https://developers.weixin.qq.com/miniprogram/dev/framework/open-ability/subscribe-message.html
3、小程序模板消息文档
https://developers.weixin.qq.com/miniprogram/dev/framework/open-ability/template-message.html