Add Facebook to Your OAuth App
Step 1: Visit https://developers.facebook.com/apps
You'll be prompted to log in. Once you're logged in, click on "apps".
Click on “Create new app”.
Give your app a name, agree to terms, and click on the "Continue" button.
Copy your App ID and App Secret. Return to Apigee to paste them into the setup form.
In the Select how your app integrates with Facebook section, select “Website” and enter your app's base url as https://YOUR_APP_NAME-api.apigee.com