Creating user database via API

[Ehsan]

I want to add a user to existing database throw API, I search this and read these pages:
http://www.directadmin.com/api.html
http://www.directadmin.com/features.php?id=503
http://www.directadmin.com/features.php?id=335

And I didn't find anything about that, Is there any way to doing it?

Any help would be much appreciated.