Google has a new Android Payment Extension for the Google Checkout Store Gadget. This allows people to make purchases with their phones, and would be helpful to merchants who wish to accept credit cards.
"Once your customer tells you the items he or she wants to buy, you can create a cart with those items on your laptop," explains Peng Ying of the Google Checkout team. "You then click the green Checkout with Android button and have the customer scan the QR code displayed with their phone. The QR code directs your customer to the buy page where they can complete their purchase."
"While this payment method may not be perfect for all cases, we hope you find it useful for setting up a shop on the go and that it inspires further innovation in the mobile and payment developer communities," adds Ying.
Steps for setting this up can be found here.