Prior to departing on your next international trip, don’t forget to phone your credit card companies to notify them of your travel plans - dates, destinations and even airline routing as you may need your card in a foreign airport along the way.  This may help to avoid any frustrating charge denials when trying to make a purchase on your vacation. 

Most all credit card companies now have a foreign currency fee for international charges so this is also a good time to ask what percentage they charge on foreign transactions.