Mobile app for parking with map and payment

We run a network of paid parking lots and want a mobile app that lets a driver find a free space, pay for it and leave without touching a terminal. The core screen is a map that shows nearby lots with the number of free spaces, updated close to real time. When a driver taps a lot, they should see the price per hour, working hours and how to get there, then start a parking session in two or three taps.

Payment is the heart of the product. A user saves a card once and pays for the current session from it; while parked they can extend the session before it runs out and receive a reminder shortly before expiry. Every completed session becomes a record in a history list with the address, duration, amount and a receipt the user can open and save. The app must behave sensibly on a weak connection: a lost signal in an underground lot should not lose a payment or double-charge the driver.

We expect both iOS and Android from one codebase, a clean and calm interface, and honest handling of edge cases — a full lot, a declined card, an interrupted extension. Please describe your stack, your experience with maps and payment providers, and how you would test the payment flow. Server-side APIs exist in draft and will be finalised together with you.