I did it over a 3g connection in a car park on the way into work. I didn't know if id have zero ordered or 5 lol! i pressed confirm a few times on a few devices but didn't have any confirmation on any. well pissed off. then i checked my orders, 3 showed up then someone from apple called me. They were cool about it due to what when on with no confirmation.
apple called because of a random fraud check, the nice american lady was nice though! ;)