Remote EV Charger Management App

I need a production-ready mobile application that lets drivers start, pay for, and document charging sessions at our remote EV stations. The app must run smoothly on both iOS and Android and connect to the existing hardware through a simple QR code that is affixed to every charger... (Budget: $1500 - $3000 USD, Jobs: Android, Android App Development, Flutter, iOS Development, iPhone, Mobile App Development, Objective C, React Native)