Step 1: Click on this page https://www.linkedin.com/developer/apps then login with your account.
Step 2: Click on “Create App” button.
Step 3: Fill in the form > Click "Create app"
Step 4: Navigate to “Auth” tab, click on the pen icon to add Redirect URLs
Enter your Redirect URL > Click "Update"
Now you are done, just copy the “Client ID” and “Client secret” then paste in Social Login Pro app setting.
Your app need to be verified by administrator of Company page that you entered on Step 3. To verify your app, navigate to "Settings" tab > click on "Verify" button.
Click on "Generate URL" button to get a verification URL.
Copy the verification URL and send it to administrator of Company page that you entered.
Waiting for the administrator to verify your app.