I had the same thing happen with another credit card. I called the bank and they said it was an international transaction and I didn't notify them that I was going out of country. MSC uses a bank in France, I believe,
so whatever card you are using let them know when you are leaving the country. Also, be sure and use a
card with No International Transaction Fees, otherwise, you'll be charged a fee especially if they charge Euros VS US Dollars exchange charge.