Is there still documentation on IPN in Webmoney and Qiwi?

Question

PayPal

Payment to a store that accepts the IPN protocol, set up MoneyBookers, PayPal, Payza.
And sobsna speaking, the most popular - Webmoney does not give its documentation to any.
And is there support for IPN in such services as Interkassa, etc.?

Answer 1

https://wiki.webmoney.ru/projects/webmoney/wiki/We...
There seems to be everything here that can fall under the category of IPN for WebMoney. Also, IPN is not a protocol. The very name IPN is a marketing trick from PayPal. In fact, this is just a set of endpoints for organizing two-way communication between the payment system and the store. The link I left above just describes how to organize such a connection.
In QIWI, everything is more complicated. There is no documentation for developers in the public domain on their website. There are ready-made solutions, from which it is possible to pick out something. Documentation on interaction protocols is located in your personal account in the “Methods of Connections” section - without registering as a payment receiver (an online store, or, in general, anyone who accepts payments via QIWI on their websites), you can’t pull it out. Also, there is a small article on Habré: habrahabr.ru/post/198668

Answer 2

Interkassa Documentation
Actually, almost all merchants have the same system.