hey goblues,
I seriously suggest that you don't waste any more time trying to get flashcoms to integrate with vBulletin. I'm sure it is possible as I got REALLY close, but it's such a pain in the ass and the documentation is so piss poor, that I don't recommend anyone to try it until Flashcoms decides to get their head out of their asses and put some decent documentation out. Paying that kind of money for that pathetic of documentation is absurd.
My rant over though, I'd suggest contacting
2checkout.com for a possible refund, who is the company that Flashcoms uses for their checkout, at least at the time when I ordered. They were really cool and helpful to me when I contacted them.
However, I noticed that Flashcoms added a Terms and Conditions page since I was refunded, so 2checkout might not be able to refund your money. I'd still check though, because it doesn't hurt to check.
Good luck, and please keep us updated on this thread with your latest news.