❔ How do I process a Alipay or WeChat Pay payment QR code (I scan the customer's payment code)...

...by calling their APIs?

Most likely

I mean, how?

Like, how do I use the APIs?

Expected behaviour: User sets desired amount of money to collect in program, then scans the payment code, causing the numbers to be entered into the program. The program then sends this code to the Alipay/WeChat Pay API (depending on which payment method is used) to collect the money, and tell the user if it was successful or not.

what their docs says?

The WeChat api or Alipay have a callback url

that url will show the QR code to let customer pay

Or you can search the github, there’s a library can do all things for you by input some configuration variables

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