1. The process of WeChat payment is that the merchant initiates a payment request - the WeChat payment background returns the corresponding QR code - the user scans the payment - the background confirms that the payment is successful - initiates a callback to notify the merchant - the merchant system Return a response;

2. When the merchant system does not return a response, the system will initiate callbacks multiple times to prevent the merchant's system from being unable to obtain the transaction results;

3. This kind of problem occurs The reason is that the merchant's system network signal is not good. You can change it to a 4G network and this problem will not occur