How do Google validate my feed ?
Once your feed imported in your Google Merchant Center account, it will go through several validation processes to verify that it conforms to the requirements laid down by Google.
To know the Google Shopping rules and requirements, please click here to visit the Shopping policies.
Google will actually have, among other validation processes types, a human being which manually checks feed content before validating it. It includes checking prices in the feed against prices displayed on the website. Content of the feed (titles, descriptions etc...) will also be checked to verify that you respect Google's policies.
This verification can take several days. It usually takes about 7 days, but it can sometimes take up to 3 weeks. Just be patient... Note that your feed will NOT need to go through this process again when you later update it.