You could just put up a QR code of a bitcoin address and let people scan over that with their phone and pay in one click. Think of the money saved! Run a bitco

You could just put up a QR code of a bitcoin address and let people scan over that with their phone and pay in one click. Think of the money saved! Run a bitcoin wallet on some junker computer, print out a million copies of your barcode, and off you go. Albeit, they have to manually enter the payment amount with static wallets, the alternative is to have any kind of localized computer that can transmit to the phone the address and debit (in any form - nfc, bluetooth, wifi, qr codes, whatever).