1. 第一步是需要在微信公众平台配置，具体参考官方文档订阅消息配置
2.然后需要在前端代码中调用微信消息订阅api，调起客户端小程序订阅消息界面，具体api参考订阅消息api
点击查看代码
wx.requestSubscribeMessage({
tmplIds: [''],
success (res) { }
})
3.后台调用，根据相应触发条件调用微信发送订阅消息api。首先调用获取access_token的api 获取接口调用凭据 ，然后根据获取到的access_token调用发送订阅消息api，文档参考：服务端订阅消息api
后台用的是node.js写的，看参考以下代码
点击查看代码
const axios = require('axios')
const baseApi = "https://api.weixin.qq.com/cgi-bin/message/subscribe/send"
router.get('/sendmsg', function (req, res) {
axios.post("https://api.weixin.qq.com/cgi-bin/stable_token",{
"grant_type": "client_credential",
"appid": "wxcc5c77f7c83b70c3",
"secret": "5adf6eedc5b5d6eb1f7d93ab8b2ed046",
"force_refresh": false
}).then((resT)=>{
res.send(resT.data)
if (resT.data.access_token) {
console.log(resT.data);
let access_token = resT.data.access_token
axios.post(baseApi + "?access_token=" + access_token, {
"touser": "o5CWU5EZCHx4d1021eCWJBGthI8k",
"template_id": "0a0GLcJOQUsb3er_LIeWROvP5HzEY0jjtSt9ItlhjK8",
"page": "pages/index/index",
"data": {
"thing2": {
"value": "2023 争创辉煌"
},
"thing4": {
"value": "上海标源2023誓师大会"
},
"thing6": {
"value": "经开区15大街255号"
},
"thing11": {
"value": "奔波儿灞"
},
"date5": {
"value": "2023-03-08"
}
}
}).then((resMsg) => {
console.log(resMsg.data);
if (resMsg.data.errcode == 0) {
res.send("发送成功！")
}else{
res.send("发送失败！"+JSON.stringify(resMsg.data))
}
})
} else {
res.send(resT.data)
}
})