To connect a payment system PayBox to the WordPress site via API

Hello!

Is there a website on Wordpress, need to connect the payment system PayBox by adding API code of the website.

Instructions:

https://paybox.money/docs/ru/pay-in/3.3#tag/Inicializaciya-Napryamuyu-cherez-PayBox/paths/~1init_payment.php/post

https://paybox.money/docs/ru/pay-in/3.3#section/Formirovanie-podpisi

https://paybox.money/docs/ru/pay-in/3.3#/paths/~1{$request.body#pg_result_url}/post

https://paybox.money/docs/ru/pay-in/3.3#tag/Vspomogatelnye-zaprosy/paths/~1get_status.php/post

WP version is 5.4 so the module Paybox it doesnt work, it havent updated.

It is desirable that you have already had experience getting this payment system.

Please respond with an execution period and the desired reward.

Thank you.

PS: alternatively, if you know also some very good payment system that is easy to connect to WP 5.4, write about it, too, may be will choose to connect it, not PB.