LinkedIn App Setup Guide
Log in to LinkedIn and go to https://www.linkedin.com/developer/apps/new and click on ‘Create Application’
Under the “Authentication” section on the left – check all the Default Application Permissions as below. There is no need to fill out the rest of the fields below.
Under the “Settings” section on the left – set your application status to “Live”.
The “Client ID” under “Authentication” section is what you will need to enter under your ShareDisc settings in WordPress.