This article outlines how to archive/delete/remove an active client Gift Card
Note: Removing a voucher will cause it to become inactive, but will not free up the Serial number to be used again. There is no way to free up a used Serial number.
Go to Manager > Gift Cards/Vouchers
Select the voucher you want to archive, then click the Archive button.
Expired Gift Cards
Expired gift cards display their Status in Red.