I ordered something on line via credit card domestically, and had the card shut down because of the way they completed the transaction. Apparently, the 3 digit code on the back was needed for the way they were submitting it, but their website did not have a field to enter it into.

They tried the transaction 3 times, and this caused my institution to shut down the card. I was doing this at work, and my wife called me like 3 minutes later stating that the credit union called to let us know there was activity on the card causing it to shut down.

I called the credit union back and had to go through the authentication process too to get it re-instated. I appreciate the speed and manner in which they handled the situation.