This is a new one on me.
As luck would have it, twice in the space of the past 24 hours, I've had a need to make a payment to businesses in Europe, online, using a credit card.
In both cases, my payments have failed - repeatedly, using a stack of different credit cards. Not because my bank declined the charge, but because the merchant is using some payment security system they call "3-D Secure." After fighting with this system a dozen times today, I've been told by one of the merchants that my US-issued credit cards won't work with their system, and I'll need to send a bank transfer. They explained that with this system, if your credit card is set up for it (none of mine are) apparently the system sends you an SMS message with a unique code, which you then are prompted to enter. Only after doing that does the merchant charge your card.
I've got a pile of well-known US-issued credit cards, of all the local flavors (Visa, MC, Amex), all issued by gigantic mega-banks. All the cards have plenty of credit, they're in good standing, and none of them work. The banks never see a charge that's causing them to flip their suspected fraud triggers, the transaction never reaches the bank - it's short-circuited by the "3-D secure" system used by the merchants to process the payment.
I've never heard of this thing before, but it has suddenly blocked me (and twice in one day!). It's a major PITA.
Haver you all run into this before? Have you found any way around it?