I've never developed an addon for Xenforo, but I'm interested in trying my hand at it. I have a fully functional system with quite a few database tables and several PHP files. I'm really looking to integrate the user table for my standalone application into the Xenforo user database and create an all-in-one system. Does anyone have any documentation or links to documentation that would outline the best way to go about doing this? I've done quite a bit in the past with vBulletin 2.x and a little bit with 3.x, but I don't have much knowledge on how the Xenforo backend functions in terms of hooks, phrases, templates, et cetera. Any and all help is greatly appreciated.