I am using this ManageEngine Support center plus API to manage requests through a C# project. I am following this link below for documentation. 

https://www.manageengine.com/products/support-center/help/adminguide/index.html

The problem I am facing is that when I try to reply to a request, using    the "sendReply" API call,  I get the following error message :" The API has been changed for this feature. Please update your app."

How do I get the updated version of this feature ? and Is there another link that I can follow for the updated API?

Any help is much appreciated.

Thanks.