Most popular platforms provide their own OAuth 2.0 documentation, which can be integrated directly into a custom plugin or even within your theme’s functions.php file, depending on your project requirements.

Alternatively, you may consider using the Simple JWT Login plugin, which comes with a built-in Google OAuth 2.0 configuration out of the box. This plugin is highly extensible, as it offers multiple hooks and filters that make customization straightforward.

To tailor the functionality to your needs, you can leverage these hooks to modify authentication flows, user handling, or token management. Well-structured documentation is available for these modification points, ensuring developers can adapt the plugin seamlessly without heavy code rewrites.

Reference Links:
Google OAuth 2.0
Facebook oauth2