There is an old API documentation at http://mekanimo.com/api_doc/.
This was automatically generated using Doxygen and I think it is
showing its age.
There is some programming examples at
http://mekanimoquickhelp.s3.amazonaws.com/modelling/behaviors/index.html.
This is part of the reference documentation.
A list of the methods and properties of the classes can be viewed from
the "Object Tree" in Mekanimo as well.
If you need anything specific, you can post a question here and I can
try to give you an answer.
Fahri