Carl Bialik from WSJ writes "Google is set to introduce a test version of its GBuy online-payment service as early as this week, presaging a shake-up in the online-payments market now dominated by eBay's PayPal, the Wall Street Journal reports. From the article: 'Here is how the service will work: Consumers who search for items like "shoes" or "strollers" on Google's search site will see text ads with a symbol or icon designating advertisers that accept GBuy payments. Shoppers normally would have clicked on an ad and been linked to that merchant's Web site. Now, while they will still be linked to the merchant's site, they will go through a different checkout process integrated with Google if they choose GBuy for their transaction. Details of the service could still change before Google's official GBuy announcement.'"