Two years ago we released the Heroku Platform API (v3), providing a supported way to automate and instrument Heroku and making it even easier for you to build new products. Today we are deprecating the legacy, unofficial version of the API that preceded it (v2), as its usage is limited and we are focusing development on the newer, officially-supported API.
We will sunset v2 of the API on April 15, 2017. For security reasons, we will be sunsetting support of auth in query string sooner, which we will announce in the Changelog.
If you are using the older version of the API, we recommend transitioning to v3 as soon as possible. Please reach out to us through support if you have any questions as you make the transition.