MyBB Community Forums

Currently I have designed my site's accounting system to piggy back on MyBB's system, however it would seem that - in using MyBB Integrator - that I cannot correctly determine if a user is online or not. Is there a way in which I can enable MyBB Integrator to determine this, or otherwise, an alternative solution to checking that a user is online from outside of MyBB?

Thanks in advance for any help!