Registering your application to LinkedIn
To use LinkedIn authentication on your website, you first need to create a LinkedIn application:
Sign in to your LinkedIn account at https://www.linkedin.com or create a new account.
Click Create Application on the My applications page.
Fill in at least the required fields (marked with red asterisks).
Click Submit.
LinkedIn redirects you to a page showing the details of your application. On the Authentication tab, you can find the Client ID and Client Secret values. You need to enter these values in Kentico: Settings -> Social media -> LinkedIn. See Settings - LinkedIn for more details.
Apply with LinkedIn program
If you wish to load birth date values for users who register on your site using their LinkedIn credentials, your LinkedIn application requires the r_fullprofile permission. Loading of the birth dates can be configured through the Require birth date property of the LinkedIn logon web part. If you enable the property without the required permissions for your LinkedIn application, registration and authentication will not work.
To obtain the permission, you need to apply and be approved for the “Apply with LinkedIn” program: Apply with LinkedIn