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Square, Google, PayPal and many other mobile payment providers overhauled their technology in 2013. Here's a look at how things changed, on the surface and underneath. (Image: ShutterStock)
Google first redesigned its mobile wallet to place a new focus on P2P payments. This new version (left) was also Google Wallet's first on iPhones. Google next began emulating the NFC payments function, its app to finally perform contactless payments on AT&T, Verizon and T-Mobile handsets.