You have purchased a domain from Google domains, and now you want to cancel it and want your money refund. But make sure that you take this action within 5 days of the purchase of the domain name. Below is the screenshot of the Google Domain Refund Policy page:
Cancel Google Domain Process
To cancel recently purchased Google domain click on the following link Google Support and choose chat, email or request a call option. By talking with the support executive, you would be able to cancel your domain and can get your money back within 5 days of purchase.
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Hope that helps.