QR code tipping is a "scan-to-tip" option that lets guests leave gratuities digitally from their phone, usually by card or mobile wallet, without downloading an app or touching your POS. It tends to make the most sense in service moments where staff are helpful but the guest isn't already paying at a terminal—like housekeeping, tours, valet, spa service, and deliveries. Done well, it's simple, optional, and clearly explained; done poorly, it feels awkward, confusing, or like a hidden fee.