In order to register our client application with Facebook, we need to go to the Facebook Developers page. At the time of this writing, this is located at https://developers.facebook.com/.
From here, you can create your Facebook application and configure its settings.
Let's start by creating our application. The application creation page looks something like this:
Tip
Display name and namespace are not OAuth 2.0 properties. Rather, these are good examples of Facebook-specific application properties which they likely use for their own application management. Fill in whatever values you wish.
Once you've created your application, you'll be presented with a configuration screen that looks something like this:
Notice that at the top of the page near the application name, we are given an App ID and App Secret. This is our client ID and client secret, respectively.