The data deletion callback is called whenever an app user removes your app and requests that you delete their data. Your app users can do this by going to their Facebook profile and clicking the Send Request button on the Settings & Privacy > Settings > Apps and Websites page.


Facebook Data Deletion Instructions
  1. Go to your Facebook Account's Setting & Privacy. ...
  2. Look for “Apps and Websites” and you will see all of the apps and websites you linked with your Facebook.
  3. Search and Click “cpostinternational” in the search bar.
  4. Scroll and click “Remove”.