I need an end-to-end delivery application that ships simultaneously on iOS and Android. The product will serve two audiences—customers who place and track orders, and couriers who accept jobs and update their status—so the UX must switch cleanly between those roles. Core features are non-negotiable: live GPS tracking that remains accurate to the meter, a secure in-app payment flow (card and wallet support preferred), and automated push notifications at every key milestone from pickup through drop-off. I’m comfortable with React Native, Flutter, or any other modern cross-platform stack as long as performance is smooth and native APIs for location, payments, and notifications are handled properly. Please structure the build so I receive: • Production-ready iOS and Android binaries • All source code and build scripts in a private repo • A brief setup guide and API documentation for any back-end services you hook in I’ll test against real devices; acceptance hinges on friction-free onboarding, instant location updates, and successful end-to-end payment in the sandbox environment.