API documentation?

Hello,
Just wondering if there is API documentation somewhere. I couldn’t find any in my searching. I think I’ve found the main function that is called to duplicate a post or page, duplicate_post_create_duplicate, which is all I really need, but others may find it helpful to have a list of useful functions and descriptions in case they want to leverage your plugin from code.

Thanks,
James

http://ww.wp.xz.cn/plugins/duplicate-post/