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Re:Your Coffee Shop Doesn’t Use Two-Phase Commit (Starbucks ... by smackfu on Thursday March 15, 2012 @09:30AM (#3708319)
IIRC, they also to use the two-step method. You pay at the register and then go over to the person making coffee and give them your slip that says what you ordered.

As far as pricing, I don't think you can make a living selling shots of espresso for $1, unless you sell an awful lot of shots or sell a lot of other things.

Re:Your Coffee Shop Doesn’t Use Two-Phase Commit (Starbucks ... by carlob on Thursday March 15, 2012 @11:05AM (#3708739)
If all you need are 400 sq ft and one or two persons behind the counter. And of course they also sell all sorts of other beverages (also alcoholic) and sometimes cigarettes and phone recharges.