Google is one of the OAuth 2.0 identity providers you can use to authenticate visitors to your Power Pages site. OAuth 2.0–based identity providers require a client ID, client secret, and sometimes a redirect or reply URL. This article describes the following steps:
If you already have a consent screen for your website's top-level domain, skip to Add credentials. If your site has a consent screen but you haven't added the top-level domain, skip to Enter your top-level domain.
In the left side panel, select Credentials.
Select Configure consent screen.
Select the External user type.
Select Create.
Enter the name of the application and select your organization's user support email address.
Upload a logo image file if necessary.
Enter the URLs of your site's home page, privacy policy, and terms of service, if applicable.
Enter an email address where Google can send you developer notifications.
Enter your top-level domain
Under Authorized domains, select + Add Domain.
Enter your site's top-level domain; for example, powerappsportals.com.