You can sell gift cards with unlimited validity period, or sell them with a default validity period (in days). To do so:
At the center level, click the Admin icon and navigate to Organization> Centers.
Click the Settings tab and expand Invoice & Receipts.
Select the Allow gift card to expire checkbox to give a default expiration date for all gift cards sold.
In the Default validity period in days box, enter the default validity of the card in days.
Clear the checkbox if you want to sell gift cards without an expiry date. This implies that the gift card could be used at any time in the future, without any expiry date. The card appears as “Never Expires” in the guest profile.