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Walmart hasn't adopted Apple Pay, and it's not clear whether it will (though one report I read said the company is increasingly open to it). Now, however, you have another option for paying at Walmart. Last week the company launched a new mobile payment system at selected stores that lets you pay for your purchase at the checkout counter by scanning a QR code with your iPhone or iPad. (For it to work on an iPad, though, you'll likely need to have a cellular data model.) The new mobile payment system will be available nationwide by the first half of next year.