Just so you know. the Quick Books merchant accounts have HORRIBLE rates. I have a friend who uses it because she doesn't care about the extra percent or two of her sales since her profit is so high, but this is bad. You really should consider a better option for a merchant account.

That being said, there are some people who want it, and we should support it in Ubercart. Hopefully someone can help you with this if I haven't changed your mind.
Peace,
Andy