If you’re asking about Walmart selling Google Play / Amazon / whatever gift cards, they get a commission on the sale, in the neighbourhood of 5%.
If you’re asking about Walmart selling Walmart gift cards, it’s even simpler, they encourage you to shop at their store. If you buy a gift card as a gift, you’re directly encouraging someone else to shop at that store. And most users will spend a little extra on top of the gift card value, or even return to the store after they’re acquainted with it.
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