How to verify & claim your domain on GMC through the app?

In the Google Merchant Center dashboard, click the Settings icon, then go to Business Information.
On the next page, click the Website tab and enter your website URL. Click Save.
Step 2: Add the HTML to verify your Shopify website
Choose I have access to my server, click Add an HTML tag to my homepage, and then copy the meta tag.
Step 3: Add the meta tag to your Shopify store.
Log in to your Shopify account, and navigate to Online Store > Themes. Click the Actions dropdown, then choose Edit Code.
Go to {/} theme. liquid and paste the meta tag. The next thing you need to do is to click ctrl + F on your keyboard, then type or paste in the search bar. Then, click Enter.
Next, paste the meta tag you’ve copied BEFORE this header. Then, click Save.
Step 4: Verify your URL
Go back to your Google Merchant Center account, click on Verify URL and Claim URL button to claim your Shopify website URL.

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Step 2: Add the HTML to verify your Shopify website