Google Product Feed is a WordPress plugin by YITH which will create product feeds for you. These feeds can be sent to Google Merchant but prior to it register yourself in Google Merchant.
YITH Google Product Feed – Main Features
- No limit to the number of feeds that you can create
- Include all products in the feed, or just the ones in the selected category and/or tag
- Generate feeds as .xml and/or .txt files
- and many more.