I need a polished, fully native Android application that lets customers browse a catalogue of physical goods, add items to a cart, and complete a secure checkout. The entire flow—from product discovery to order confirmation—should feel fast and intuitive on modern Android devices. My priorities are: • Smooth product browsing with clear categories, search, and filters • A dependable cart and checkout process tied to a popular payment gateway • Secure user authentication and profile management • Basic admin interface (web or in-app) where I can add, edit, or retire products, photos, prices, and stock levels • Clean, maintainable Kotlin/Java code and well-commented project files Deliverables 1. Production-ready APK plus signed release build 2. Full Android Studio source code with build instructions 3. Brief hand-off document covering environment setup, key libraries, and how to add new products If you have existing components or templates that speed things up, great—as long as the final experience feels tailor-made for my brand. Please include examples of past Android commerce or shopping apps you have shipped.