Authentication Sources
LinkedIn/Oauth2
From linkedin developers, create an app and follow below instructions

Create an app
- Create an app, company needs to be verified

Settings tab
- Add your domain to widgets

Auth tab
- Add your redirect url like $your_domain/login/callback/oauth/linkedin
- Scopes must include r_emailaddress and r_liteprofile

- Copy client id and secret

Login Url
- Login url must be your reachable url for clients, and this url will be used for oauth, enter your domain

