1xBet Apple-of-Fortune Logic

I need a self-contained Apple of Fortune game core identical to the one on 1xBet, but written so it can drop straight into a mobile app. Graphics, animations, and UI will be handled separately; what I’m after is the underlying engine that powers every round... (Budget: ₹12500 - ₹37500 INR, Jobs: API Development, C# Programming, Flutter, Game Design, Game Development, JavaScript, Mobile App Development, React Native)