I'm using 2checkout to process credit card transactions on my site. When trying to make a trial buy in live mode recently I get the error message "credit card authorization failed". I tried 3 more cards with the same results. Support at 2CO says the message did not come from them, that "it had to come from the credit card company". I called Master Card and they say that there was nothing wrong with the cards or accounts. They say the message did not come from them. Back to 2CO, no change in their position. Has anyone ever seen this message? I'm running out of ideas. Thanks.