Go to the official website of the Vanilla gift balance. On the website, you'll typically find a section to check your Vanilla gift balance. You'll need to enter the card number and the card's expiration date, which are usually printed on the front of the card.
https://vanilla-gift-balance.jimdosite.com/
https://vanilla-giftbalance.brizy.site/
https://sites.google.com/view/checkvanillagiftbalance/