Which third-party licensing service to choose?

Question

Payment systems

Good afternoon!
There is a free web service, I want to provide advanced functionality on it for a fee using subscriptions in the form of in-app payments. It is necessary to authorize the user, accept the payment and store information about it at least until the end of the subscription expiration date.
I do not want to create my own licensing server yet, I cannot spend resources on it. A third-party service like the Chrome Web Store would be great, but it doesn't sell apps to Russian citizens, which I don't like.
Which third party licensing services might be suitable for a web service?

Answer 1

Let
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