Google has announced a convoluted way for sellers to accept payments from buyers using QR Codes. The seller must set up the Android Payment Extension for the Google Checkout Store Gadget on their laptop first. Then the seller can use their laptop to create a shopping cart with the items the buyer wants and then displays a QR code which the customer scans. The QR code directs the customer to the checkout page where they can complete their purchase. More details on Google Checkout Blog.