Square's Register app has done a lot to drag stores' payment systems into the modern era, but only in the US -- venture elsewhere and you've usually had to pay at a conventional (and often very limited) terminal. That might not hold true for much longer, since Square has just released a version of Register that works worldwide. The Android and iOS software now handles sales in 130 currencies, and communicates in French, Japanese and Spanish; if a tapas bar in Madrid wants to give you a digital receipt or ask for feedback, it can. It'll take a while for companies around the world to start using Register, but don't be surprised if you see it in action the next time you go on vacation.
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