Verifying and claiming your store’s website are two essential steps in setting up your Google Merchant Center account. In most cases, once it’s done, you won’t have to do it again.
Now link your store directly to your Google Merchant Center account. Verify and claim your store by pasting below the HTML code generated from your GMC account dashboard.
Once this is done, you can start uploading product data and create product feeds that can be linked to your Google Ads account for marketing with Google Shopping Ads.
After you have added your website URL in GMC, you need to verify your website by clicking on "Add an HTML tag".