If you click on the Product link in your Google Merchant Center (GMC) account, you’ll now see a column for Product Ads.
Clicking on the ? next to Product Ads brings you to a basic page that discusses the various destinations for Product Listings. Here’s the Product Ads page which discusses the various attributes you can include in your data feed to control your Product Ads:
Grouping parameters
-adwords_grouping
-adwords_labels
Tracking parameters:
adwords_redirect
adwords_queryparam
As the holiday shopping season approaches and retailers are looking for any and every way to increase sales, expect more merchants to adopt product ads. Also expect some confusion as there have been a number of changes to the Product Ads specification over the last year. Get started testing right now.
Most important thing to note for merchants, though, is that you need to start with a high quality data feed. Go beyond the basics.
Posted by Brian Smith 
