May 18, 2021 WeChat Mini Program Development Document
Messaging capabilities are an important component of small program capabilities, and we provide developers with the ability to subscribe to messages in order to implement a closed-loop service and a better experience.
Manually configure the Get Template ID on WeChat Public Platform: Log in to https://mp.weixin.qq.com to get the template, and if you don't have the right template, you can request to add a new template that you can use after approval.
See the small terminal message subscription interface wx.requestSubscribeMessage
See the service-side messaging interface subscribeMessage.send