What is the best way to sell through a mobile application?

Question

Android

Hello. Guys, help me out! The situation is this. We are selling e-books. We pay pianos to the authors. About 70% of the cost of the book. We sell through the website. We want to drink mobile applications, but there was a question about selling through applications. If you sell "in app", then the buzz or Apple takes 30% of the amount for itself. That is, it turns out that if the book costs 100 rubles, we must pay the author 70 rubles of the piano and another 30 rubles will be taken by the service. And we have nothing left. You can add 30% to the price, but then the price of the book on the site and in the application will be very different, which is also bad. And if you lead to sell from the application to the site, then this is ugly and inconvenient for the user, besides, I heard that this is not allowed according to the rules for placing the application.
The question is how to be? Is there a way to sell in the application without transferring the user to the site and not paying a commission of 30% to Google? Are there sanctions from marketplaces if a user goes to the site to pay? Do you know how smart people act in such a situation, what would you advise?
Thank you very much in advance!

Answer 1

You have content that does not depend on the platform. The same story as with audio recordings. Google rules in such cases allow the use of third-party payment systems.
Take any SDK, connect and collect payment from users from the application.