I created a thread in the Addons Discussion forum but received no response, so I'm posting here. I've looked at XenAPI, but it seems to miss this crucial functionality. I've found a few people getting help with this topic, but never a concrete example. I need to write either a standalone script, or a plugin for XenForo which lets me fire off the Login, Logout, and Register functions from an outside script. I see a few possible ways to go: Override/extend Xenforo's existing Login, Logout, Register functions to not require a password Create a XenForo plugin that takes some kind of encrypted key from our third party script that says "login user X". Keep passwords synced between my 3rd party script and XenForo. If I can get this working, I will be purchasing another XenForo license.