When creating a gift card/voucher, the default expiry date is 3 years from the creation date. You can change this when creating it but you may need to adjust the expiry date should you want to extend the validity period.
On the left navigation menu, click on 'Gift Cards':
Search for the gift card/voucher you would like to delete using either the client details or the gift card code:
Click the 'Options' dots for the gift card/voucher you would like to delete and click on the 'Edit' menu option. From here, you can edit the expiry date of the gift card/voucher.
Note: If you do not see this option, this will need to be done by a user with Administrator or Branch Manager access.