vBulletin affiliate program mod...

Is there one?

I've been searching high and low and can't manage to find one. I need it to track my members referals (for subscription payments) and give me an option to easily pay them via paypal at the end of the month.

Anyone know of anything capable of this?

Here's an invitation system:

http://www.vbulletin.org/forum/showthread.php?t=171951

Or here's the VBCredits which assigns points to people when they do stuff, i.e. refer people.

http://www.vbulletin.org/forum/showthread.php?t=172399

I know it's not what you're looking for but that's all i can think of off the top of my head.