Create an app in the Linkedin Developers Portal.
In the "Products" section, choose "Sign In with LinkedIn"
In the details page of the created app, click the "Auth" tab
Take notes of "Client ID" and "Client Secret", add https://<YOUR_AUTHGEAR_ENDPOINT>/sso/oauth2/callback/linkedin
to "Redirect URLs" in "OAuth 2.0 settings" section
In the portal, go to Authentication > Social / Enterprise Login.
Enable Sign in with LinkedIn.
Fill in Client ID.
Fill in Client Secret.
Save the settings.
🎉 Done! You have just added Linkedin Login to your apps!