How does a one-time redeemable coupon work?
A QR Code coupon that can be redeemed once works in such a way that you create a series of unique QR Codes that once scanned redeem the voucher. You can print these unique QR Codes or send them by email. The validation is done by you or an employee by scanning a unique QR Code.
You can redeem the voucher with any QR Code reader that is installed on a smartphone with an internet connection. As soon as the QR Code on the smartphone display is scanned, the vouchers are redeemed.
You can also redeem the voucher without a QR Code scanner by tapping the redeem button below the QR Code.