Really stoked about this. I wish they had more details on the process, though.<p>At first exposure, the idea sounds really, really cool. But it sounds like they're breaking the normal purchase loop. Imagine lunch, for example (assuming you've already set up your tab, which is a lengthier first-run experience). You go up to pay, and then... what? TC explains it as:<p>> So once you press that button within two blocks of the merchant, you’ll be able to tell the cashier your name and your card will be charged on the merchant’s backend Square register.<p>So do you pay in advance? Afterwards? (In which case, can I just walk out and screw the retailer?) Do I as the user set up the bill, or does the merchant and I have to review it? Does either party have to wait for the other to confirm something? I've already been at Square retailers that have skipped Square during times of high customer peaks (opting for cash, which was much quicker).<p>These are probably just early questions that will look obvious and boring once it's all figured out and public, but right now I'm scratching my head a little.