What do you mean by paid callback?

Collection refers to the rising trend of prices caused by it.

There will be two callbacks after Alipay interface payment is successful.

One is synchronous call and the other is asynchronous call.

The synchronous call will call back the address of the synchronous call callback page you set immediately after you successfully pay, jump to this page and execute the code inside.

The other is asynchronous call, which will call back the address of the asynchronous call callback page you set immediately after your payment is successful. It will not jump to the page you set, but execute the code in it.

You can see if the parameter type passed in is incorrect, or if the method logic in it is wrong.

Wechat payment callback means that users can dial back through WeChat payment, and judge the payment result according to the return value after payment is completed.

Modify the database through the returned results (complete the desired function).