check" the balance on the gift card
Where can I use my Walmart Gift Card? The physical (tangible) cards that come with PIN (personal identification number) can be utilized at every United States or Puerto Rico Walmart stores as well as Sam's Club, including parts of the facilities which are operated by Walmart.
In most cases, there's an toll-free number that you could dial to find the balance. You can also examine your balance on the site of your card issuer, entering the card's 16-digit numbers along with the security code.