Developer API? What developer API? There's not a developer API. There is a **** poor excuse for a com interface and NOTHING ELSE.
I looked on the office site and it basically said there was none. That education plugin was such a tease. It made it seem like things would be forthcoming but there's not one. Visual Studio won't let you create add ONs. there are no add ONs. THe app suggests there should be, but they aren't supported.