Google has recently launched a holiday site marking retailers who are using its Checkout payment service and then expose the money back promotion to attract its customers. Google Checkout provides a single avenue for making purchases on multiple retail sites.

Google is now looking to add customers through promotions, which include $10 off on purchase of $30 or more through this year Dec. 26. For example, if shoppers visited five participating merchants and spent between $30 and $49 on every site, they will get back a total of $50.

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