l00py - 12:37 am on Jun 19, 2010 (gmt 0)
Visa and Mastercard have a number you call to get the phone number of the issuing bank.
I just tried this today. It's asking me for an "account number" -- where do I get the account number?
I tried entering the last 4 digits of the buyer's credit card, but that failed. Visa's customer support won't give me any information unless I have the FULL credit card number; which I do not, otherwise I would be violating the PCI agreement.