Android Aviator Betting Game

I want to launch a private Aviator-style crash game that runs natively on Android and lets users wager real money through integrated payment methods (card, UPI, wallet, or any gateway you recommend that passes Google-Play policy by running outside their billing system)... (Budget: ₹12500 - ₹37500 INR, Jobs: Android, Backend Development, Game Development, Java, Mobile App Development, Payment Processing, PHP, Unity)