I placed an order for a customer the other day with my own credit card. Put in all the information and when I submitted got the red error message indicating something was wrong. Went back and could not see what it was. Submitted again. Same error message. Went back again and this time it said my credit card number was wrong. So I figured I'd fat-fingered something and put it in again, very carefully. Submitted and it took. All was well.
But . . . and this is why I'm adding to this discussion . . . the next day the same charge was on my credit card twice. In once, cancelled. And in again. Absolutely identical. So I wasn't charged more than I owed or anything, but obviously the first transaction went through just fine but something at FAA thought this was not the case.