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.
Note:
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.