At this time the API isn't documented. It will be documented for the next release, however the usage of the inherent security features of vBulletin will change significantly so most hacks will need to be reworked anyway. We plan on providing full API documentation when the system is in a state to document.
As it is now, you need to go through the include folder and review the functions there to see what they do. Not optimal but that is what there is. Before the 3.0 release we concentrated on the Admin Control Panel Documentation because it would serve the most customers. When it came time to document the API enough significant changes were proposed and/or implemented that it was decided to postpone it.
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