Upgrading to Marketing API v4.0. A few reminders for our developer community: Developers should specify /v4.0/ in your URLs when you call the API. To see details of all changes in v4.0, see the Graph API v4.0 Changelog. SDK developers should view our latest Java SDK, PHP SDK, Python SDK, or Ruby SDK.
https://developers.facebook.com/docs/graph-api/changelog/version4.0

