This voucher has not been sold yet. Activate it only after the buyer has paid in full.
The file holds the security codes and can only be downloaded once. Open it in Chrome, print (210 × 140 mm, double-sided), cover each code with a scratch-off label, then delete the file. New vouchers start as unsold until a cashier activates them.
Saving an existing username changes their PIN or role.
A copy is saved on the server every day. Download one to keep off the server too, at least weekly in the festive season.