Google documentation:
Verify and claim your website:
https://support.google.com/merchants/answer/176793?hl=en
You can verify a URL with Google using these steps:
- Sign in to your Google Merchant Centre account at https://merchants.google.com/
- From the navigation menu, click the tools icon
to the right in the top navigation bar - Select Business information under “Tools.”
- Click the Website tab.
- Enter the URL for your online store, starting with https://
- Click Save.
Verify your site ownership:
https://support.google.com/webmasters/answer/9008080?hl=en