What and how to attach payment systems to the Desktop-application?

Question

Payment systems

What payment systems exist (preferably with a small commission, of course) with an accessible and adequate API for buying a Premium account inside a Desktop application? I think that payments through the built-in browser will also work.
+ how to verify your application in the payment system. I know that payment systems do pre-moderation in online stores, but how is it here?

Answer 1

It is impossible through WebView - the user will not want to enter their payment data in an application that does not trust them.
You need to open the link in a standard browser.
This is how computer games do it, see how Blizzard did it in Heroes of The Storm or Wargaming did it in World of Tanks.
By the way, the methods are different there: in the first, purchases directly from the game, in the second, from the site.
But adding payment methods - only from the site. This cannot be done in your program.