On Wednesday, November 30, 2016 , in accordance with the deprecation schedule , v201508 and v201511 of the DFP API will be sunset. At that time, any requests made to these versions will return errors.
If you're still using these versions, now's the time to upgrade to the latest release  and take advantage of new features like HTML5 creatives , programmatic support , and retrieving saved report queries . To do so, check the release notes  to identify any breaking changes, grab the latest version of your client library , and update your code.
Significant changes include:
This is not an exhaustive list, so as always, don't hesitate to reach out to us  with any questions. To be notified of future deprecations and sunsets, join the DFP API Sunset Announcements  group and adjust your notification settings.
Chris Seeley , DFP API Team