No Change? Buy Candy With PayPal, Your Phone and Twitter

A proof-of-concept vending machine shows how we can dispense with cash for everyday purchases, skipping credit and debit cards altogether and going straight to electronic transfer.
The vending machine uses QR codes, PayPal, a smartphone camera and Twitter. And, to complete the geek-buzzword bingo checklist, the hardware is based in part on Arduino, an open source [...]

Source: http://www.wired.com/gadgetlab/2010/10/no-change-for-the-vending-machine-buy-candy-with-paypal/

UNISYS TRIQUINT SEMICONDUCTOR TRIMBLE NAVIGATION LIMITED TRIDENT MICROSYSTEMS TRANSACTION SYSTEMS ARCHITECTS