Unused gift cards

We will be closing our online shop in a few months. Since we've been open for a few years, a lot of customers have purchased gift cards, some of them remain unused.  While we plan on reaching out in advance to all gift card customers with outstanding gift card amounts to warn them of our imminent closing, I am wondering what happens with the unused gift cards when closing a squarespace commerce account permanently. Do the unused gift card get refunded automatically?