Two of our oldest APIs – The Recruit Candidate API and Recruit Test API – are being deprecated with immediate effect and they will be completely shutdown on 30 April 2015. The older APIs are replaced with a much improved v2 of the HackerRank for Work API, documented here: http://apidocs.hackerrank.com/hr4wv2
Most of the changes are backward compatible and many users will simply need to use the new v2 end points. You can read about all the changes in our Migration guide, and if you have any questions about this or need any assistance migrating to v2, please drop us a note at support@hackerrank.com