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PayPal Demos Auto-Debit Gumball Machine
ForgedArtificer writes "At their recent developers conference in San Diego, CA, PayPal unveiled a proof-of-concept gumball machine that would instantly pay for a gumball through a PayPal account using a smart phone and a QR code, sending a confirmation of the purchase through Twitter. Ok, maybe we all don't really care if we can get a gumball without a quarter, but the possibilities for this technology are endless."
A more interesting type of system would use a QR code challenge-response. A small screen on the gumball machine, or at the supermarket checkout flashes a QR code. You point your phone camera at it and details of the transaction come up on the screen. If you hit "confirm", your private key is used to sign the transaction and produce a response QR code which appears on your screen and is read back by the merchant.
This way, your phone doesn't need to connect back to the payment gateway provider at all. This is an advantage if there is bad reception inside the store, or your provider is having a bad day, or your pre-paid plan ran out, or you only have an iPod and not a smart phone. Banks could probably even produce dedicated devices that performed only this function and provide them to customers.
Be careful. People in masks cannot be trusted.
While it's not linked to a paypal account we've had IC payment here in Japan for a very long time. I've been buying things from vending machines with my phone for maybe 6 years now and as far as I know I was a late adopter.