Facebook Developer App Id. Then go to website option. Click on show in front of app secret, and you need to enter your facebook account password to see the app secret key. Go to the facebook for developers page and login with your facebook account.
Share updates and photos, engage with friends and pages, and stay connected to communities important to you. Click in the top right of facebook.
A facebook app id is a unique number that identifies your app when you request ads from audience network.
No need to follow the remaining steps. You can do this at developers.facebook.com. Your appid and appkey is created automatically. Here you can find the app id and app secret that you will need for software that uses facebook app.