So have been hearing about Android Pay. I would love to try so that don't have to carry wallet around. I am just not too sure how it works. For example, when you are about to pay, you just flash the phone or fire up the app first and then flash the phone. If you don't have to fire up the app, anyone can skim your phone like RFID and charge on your android pay. I am sure this is not possible so then question. Don't want to make fool of myself at the store. Thanks in advance.