Build an AI-assisted point of sale system for small retail shops and cafes. 1. Product catalog with variants, SKUs, barcodes, and images, plus a quick-add flow. 2. Touch-friendly checkout screen with cart, quantity edits, discounts, and split payments. 3. Card payment integration through Stripe Terminal or a provider SDK, never hand-built card handling. 4. Cash drawer management with opening and closing counts and variance tracking. 5. Receipt printing through a Bluetooth or LAN printer API, plus SMS and email receipts. 6. Tax handling per item category with configurable rates. 7. Refund and exchange flow with manager approval required for returns. 8. AI sales assistant that summarizes the day: best sellers, slow movers, peak hours, and staffing suggestions. 9. Low stock alerts and automatic reorder lists, syncing with a simple inventory table rather than a full warehouse system. 10. Offline mode that queues transactions locally and syncs when the connection returns. 11. End of day Z-report that matches expected cash to actual payments by type.