Building OAuth Strategies with passport.js Chapter 7
Upon successful creation of the application, you can see the API Key (clientID) and API
Secret (client secret) in the Credentials tab.
These tokens will be used to verify the authentication in our application:
Adding a button to our login page that allows users to log in via LinkedIn
The next step is to add a LOGIN WITH LINKEDIN button in our login page, which we
will be linking to our LinkedIn application that we just created.