WeChat Pay document has a notify_url, that is used to send payment notifications to the backend, but when you see many cases, the foreground will write this:

 wx.requestPayment({
 "timeStamp":timeStamp, 
 "nonceStr": nonceStr,
 "package": package, 
 "signType": "MD5",
 "paySign":paySignjs,
 "success":function(res){
    wx.showToast({
                title: "",
                icon: "success",
              })}
....

so there is a question: can success judge whether the payment is successful if the payment call is successful? if I can judge whether the payment is successful, my idea is to directly take the order to the backend to change the data in success, so that notify_url does not feel necessary to deal with it, if not, but many people just write to remind users that payment is successful.