Unfortunately, in most states gift cards cannot expire. What some companies do is impose a monthly service fee after a certain period of time to maintain the balance. I don’t know if TOAST could set that up but like @Rob @ I believe that would need to be a manual action. However, if it’s not spelled out at the time of purchase, you might run into some unhappy guests.
you could consider offering a discount code instead of a gift card. Discount codes can have expiration dates. I’ve use these quite often myself, and find them to be useful.
