I need a liquor-store POS app for Android that lets me close sales quickly with a built-in QR-code scanner. The scanner should instantly pull up product details, adjust stock, and add the item to the customer’s bill in one tap. Core workflow • Scan bottle → show description, price, current stock. • Complete sale → deduct inventory, log customer purchase, and save the transaction for the day’s totals. Essential modules 1. Inventory management – real-time stock levels, automatic deductions on each sale, and alerts when an item hits a reorder point. 2. Sales tracking – every sale time-stamped, linked to the scanned items, and totaled for the cash register’s end-of-day closing. 3. Customer management – capture basic customer details at checkout so repeat buyers can be recognised and their purchase history displayed. Reporting At any moment I should be able to generate: • Daily sales reports (total revenue, top-selling items, payment-method breakdown). • Inventory usage reports (opening stock, sold quantity, closing stock). Tech expectations Android (Kotlin or Java), local database synced to secure cloud storage when a connection is available, and an admin panel or simple dashboard where I can print or export the two reports above. QR scanning can rely on open-source libraries such as ZXing or ML Kit. Deliverables • Production-ready Android APK and full source code. • Documentation: setup, admin credentials, and how to back up/restore the database. • Sample daily sales and inventory usage reports demonstrating correct calculations. The solution should be lightweight enough to run on a standard Android phone, require no extra hardware beyond the camera, and be ready for test deployment in my shop. Let me know your timeline and any similar POS work you have done so I can move forward quickly.