Point of sale

The POS lets a cashier find products, build a cart, choose a payment method, create a GST-aware invoice, and reach a receipt without leaving the primary selling surface.

Platforms: Android phone/tablet and web. Roles: Cashier, Manager, Owner. Primary workflow: Complete a sale.

Required screen contracts: POS-SCR-001 to POS-SCR-005. Capture cart-empty, populated, payment-selection, success, payment-failure, and receipt-delivery/printer-failure states before declaring POS documentation complete.

Current contracts: catalogue, active cart, payment, and receipt.