Wal-Mart employee Adriana Cajuso takes payment from customer Yoalmi Matias at a store in Miami. By mid-2016, Wal-Mart says, customers will have the option of paying via their smartphones. Joe Raedle/Getty Images hide caption

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The mobile payment device by Square allows small merchants to swipe customers' payment cards with a phone. Square Inc. hide caption

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Square Goes Public And Fields A Flood Of Customer Complaints

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EBay announced it will split from the payments service PayPal, forming two independently traded companies beginning in 2015. Joe Raedle/Getty Images hide caption

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EBay Spins Off PayPal Into Fast-Changing World Of Mobile Payments

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A Nordstrom salesperson shows a customer an online selection of shoes on an in-store iPad. Like some other retailers, Nordstrom is using mobile devices to make on-the-spot sales and check companywide product inventory instantly. Courtesy of Nordstrom hide caption

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Forget The Register: Stores Use Mobile To Make Sales On The Spot

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A barista processes a customer's payment using Square, a device that turns a mobile device into a card swiper. More businesses are using the devices to simplify credit card payments. Others are embracing technology that allows consumers to pay with their cellphones. Jeff Wheeler/MCT/Landov hide caption

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What's In Your Wallet? Wait, You Don't Need One

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Square allows merchants to accept payments automatically from recognized registered customers. Square screen grab hide caption

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David Marcus, president of PayPal, unveils PayPal Here in San Francisco in March. The service allows customers to use their smartphones to pay for purchases at retail stores. Kim White/AP hide caption

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Your New Digital Wallet: In The Cloud But Still Tethered To Fees

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