Android Ordering App For Retail

My goal is to give shoppers a smooth, mobile way to browse everything I sell and send their orders straight to my store. The app must run natively on Android, show a clean product catalog, let users add items to a cart, and finish the purchase flow inside the app... (Budget: ₹600 - ₹20000 INR, Jobs: Android, Android App Development, API Development, Mobile App Development, Mobile Development, PHP, Software Architecture, UI / User Interface)