Tenders and reversals
A tender is controlled — cash, card, UPI, on account, to the room, complimentary — and a bill that was wrong is reversed, not deleted.
Money in a restaurant moves fast and is lost in the details. The POS controls the tender: every settlement is one of the outlet's own payment modes, a bill can be split across two of them, and a bill that was wrong is reversed with a reason and a name.
Tenders
Cash, card, UPI, on account (a company or a guest with credit), to the room, and complimentary with a reason from the hotel's own list. A wallet or a new gateway is a payment mode added by the hotel, not a release.
Reversal
A bill that was settled and was wrong — the wrong table, a dish that never came — is reversed. The reversal is a document pointing at the bill, on the day's report, with who did it and why. The original bill is not edited and not deleted; the GST return reads both.
Discounts
A discount is a decision with a name on it: a percentage or an amount, a reason, the login that gave it, and a ceiling per role. The day-end report lists every one.