How to add a payment system to the site via qiwi?

Question

PHP

Hello, I wrote a knife store on kohane, now the client wants to make 1 payment system, via qiwi. You can post documentation on how to do this. ps Most interesting.

Answer 1

https://unitpay.ru/
https://unitpay.ru/doc

Answer 2

https://ishop.qiwi.com

Answer 3

It works like , in css there is not enough closing }