How to process a request that comes to the client?

Question

JavaScript

I am writing a small store on react, I added a payment system using liqpay.
After clicking on the button, you are redirected to the payment page. After payment, a post-request with data is sent back.
Actually the question is how to catch this request if it is sent to the client?

Answer 1

if it is sent to the client?

It is NOT sent to the client, but to a specific URL, which is probably indicated in the settings when connecting the payment.

In 2 minutes I found the instructions on their website. How do you google?