Cross-Platform Game Slot Booking App

I’m ready to turn a simple idea into a polished cross-platform application that lets players reserve time slots for our indoor and outdoor games. The core of the project is a smooth booking flow: users choose a game, pick an available slot on an in-app calendar, and pay instantly—everything handled inside one intuitive interface that runs flawlessly on both iOS and Android.

Key requirements
• Cross-platform codebase (Flutter, React Native or similar—feel free to propose the stack you’re strongest with)
• Real-time calendar integration so users always see up-to-date availability
• Secure payment processing for both single bookings and multi-slot packages

I’ll provide game schedules, branding assets, and payment-gateway credentials. You’ll architect the database, build the app, connect the calendar, integrate the gateway, and deliver thoroughly tested source code plus installation instructions. If you can layer in extras such as push notifications later, mention it—though the first milestone is a rock-solid booking experience that’s ready for store submission.

Looking forward to your approach, timeline, and any similar booking apps you’ve shipped.