I've probably frustrated the heck out of Icon today trying to figure out why my Pre Paid MasterCard wasn't working. I assumed it was regarded as an actual Credit Card and going by the faq's, supposed to be dollar for dollar as with PayPal. Unfortunately this is not the case as Canadian gift cards is regarded as basic money, a person needs to convert it to U.S dollars.
Hope this helps anybody in the near future...
Switz