It’s 11 a.m. and time for your coffee break. Leave the office and stroll the 14 steps to the café next door. Your iPhone vibrates and asks if you’d like the usual double-wet cappuccino. Of course you do, so you tap Yes. Within a minute your name is called and you have your caffeine-rich libation in hand. Again, no cash or credit card necessary because your iPhone automatically picked up the tab.