I need a complete mobile application that lets users reserve gym time by the hour and pay instantly on their phones. The same code-base (or two native builds if you prefer) must run smoothly on both iOS and Android, matching Apple and Google design guidelines. Core flow 1. The user opens the app, chooses a date, then selects an available hourly slot. 2. A built-in payment screen processes either credit cards or the most popular local e-wallets; the charge must complete without sending the user to an external browser. 3. On confirmation, the slot is locked, the customer receives a push notification and an in-app receipt, and my admin panel sees the booking in real time. I will share a reference application to clarify the desired UI feel, navigation, and feature set. Security, PCI-compliant payment handling, and smooth error states are mandatory. Source code, build instructions, and testflight / APK builds should be part of the hand-off so I can submit to both app stores without surprises.