Updated my post, probably I will create web + applications, where you can sign in and pay from any place, pay price + x% on app or, pay price from web.
Let's see how it goes.
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No, all payments must go trough Google Store so they could get their 30% tax.
If you sell offline or have the Coupon option they will remove your app.
This is the case on all platforms (Apple, Steam, Facebook web ...)
Updated my post, probably I will create web + applications, where you can sign in and pay from any place, pay price + x% on app or, pay price from web.
Let's see how it goes.