If you have either the Sam’s Cub MasterCard or store-only credit card for consumers, you can pay: 1  Online: Log in to your account here and make your payment. 2  By Mail: If you have the Sam’s Club MasterCard, send your payment to the following address: Sam’s Club MasterCard, P.O. Box 960013, Orlando, FL 32896-0013. If you have the Sam’s Club store card good only at Sam’s Club and Walmart, the payment address is Sam’s Club Credit Payment Processing, P.O. Box 530942, Atlanta, GA, 30353-0942.