square.onGiftCardUpdated subscribes to gift_card.updated for the selected seller. It requires GIFTCARDS_READ.
Example
automations/square-on-gift-card-updated.automation.ts
Event
A gift card was updated. The balance_money , state , and customer_ids fields of a gift card can be updated through a gift card activity or when a customer is linked or unlinked. The signal resolves to the officialSquare.GiftCardUpdatedEvent payload with type narrowed to gift_card.updated.