You can print out the barcode of the Walmart Gift Card and then buy the Xbox Gift Card in store. That is what I do. I would recommend finding the $50 Card for $45 that gives you the extra $5. If your store supports Walmart Pay through checkout you can use your smart phone and the Walmart App to pay with the store gift card.
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Walmart's four-card limit: consolidate your gift cards! Jun 09, 2014 Frequently Asked Questions | How to Use a - Vanilla Gift
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How to use a Visa gift card online. Possible reasons why your Visa gift card doesn’t work online. What you need to know about Virtual Visa egift cards. Though Visa, Mastercard and other bank-issued gift cards work online quite well, there are certainly a few things to know that can make for a …