Tomorrow, May 18th, is the deadline for US-based merchants to verify & claim their URLs for the Google Merchant Center. After May 18th, data feeds uploaded for URLs that have not been verified and claimed will be disapproved.
There are two steps to verify and claim your URL:
1). First, you will first need to verify your Google Merchant Center login email as a site owner by following the instructions at the Google Webmaster Tools Help Center. If you or someone else from your company has already verified your site using a different email address, you can add your Google Merchant Center login as a site owner by following these directions.
2). Once your Google Merchant Center login is listed as a site owner for your domain in Webmaster Tools, sign in to the Google Merchant Center and click the “Claim this URL” link on your General Settings page. When the URL status says “claimed,” you have completed the process successfully.