Payment

Field	Value
Screen ID	POS-SCR-004
Module	Point of sale
Status	Implemented; evidence required
Platforms	Android phone, Android tablet, web equivalent
Roles	Cashier, Manager, Owner

Purpose

Record the selected payment method against the sale, validate the amount, create the GST-aware invoice, and move to receipt only when the outcome is known.

Actions

Action	Validation	Result
Choose cash, card, UPI, mixed, or split payment	Method must be enabled for the counter	Shows only relevant inputs.
Enter amount received	Amount must cover the payable amount where applicable	Calculates due or change without rounding ambiguity.
Confirm payment	Cart must be locked and invoice request idempotent	Creates or resolves the invoice, then opens receipt.

Timeout is not treated as failure: show a result-unknown state, lock repeated submit, and retrieve invoice status before allowing retry. Printer or receipt-delivery failure happens after a successful sale and must never reverse payment automatically.

Required captures

Cash, UPI, split payment, insufficient amount validation, request timeout/result-unknown, invoice rejection, and success transition.