PayPal Labs' recently showcased a proof-of-concept pointing to future manifestations of cashless payments.

During the recent PayPal X Innovate 2010 Developer Conference, PayPal Labs’ Ray Tanaka showcased a proof-of-concept gumball machine that combined PayPal, QR codes, a smartphone camera and Twitter to accept mobile e-payments. The otherwise ordinary vending machine, uses an Ardriuno processor along with a WiShield to enable the process. A user simply scans the QR Code to begin dispensing the candy and shortly thereafter receives a Twitter notification showing that their payment has been been processed and how much has been charged.

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