Purchase Symfonium

Hello, my free tail time up, I want to know how can I buy this app not through googleplay? Because googleplay change the rule about the payment, so we can’t pay it if we not use origin IP in usa, althougn we use some kind of vpn.

so I want to know is there another way to buy? (I can buy app directly like but can’t pay in-app payment like symfonium and yatse)

Very thanks about that, I will do it in this week.