Walmart gift cards can be used at Walmart.com, Walmart Stores and Neighborhood Markets, Walmart Gas Stations, Samsclub.com, Sam’s Club stores, and Vudu.com during checkout. All Swagbucks gift cards are shipped as egift cards that can be used in-store or online. If you have a Plastic Gift Card from Walmart that does not have a 16-digit PIN (Personal Identification Number) on the back of the card, you can use that gift card in-store but not online at Walmart.com. You can trade these gift cards in for a new card with a PIN at any local Walmart or Sam's Club store in the US. For security purposes, the Walmart website only accepts gift cards with 16-digit card numbers and PINs. All Swagbucks.com Walmart Gift Cards have these PINs.