The Walmart Credit Card typically cannot be used at Sam's Club. While both retailers are part of the Walmart family, their payment systems operate independently. The Walmart Credit Card is primarily designed for use at Walmart locations and certain online transactions through Walmart's website. On the other hand, Sam's Club has its own store card known as the Sam's Club Membership Card, which is required for shopping at their stores. It is important to note that the Walmart Mastercard can be used everywhere Mastercard is accepted, which may include some locations where Sam's Club accepts Mastercard payments. For specific details regarding payment options, it is advisable to visit the current WalMart website or refer to the terms associated with the Walmart Credit Card.