Originally Posted by onobond

Presently in Copenhagen, I was surprised to find many restaurants and shops have an extra charge of 3.75% on sales, when using a "foreign" credit card. The decision on what is foreign or not, is the country code in the phone # on the back. Using major restaurants, hotels and buying railway tickets, no extra charge. For that special present to yourself or someone special, or just stepping into the restaurant in front of you, this extra charge might be an ugly surprise.
Never seen this anywhere else in the world. Correct me please, if wrong

Originally Posted by WilcoRoger

Just paid with my Finnish credit card at the CPH Hilton, no additional charges were made.

Of course it's possible that Scandinavian cards are not regarded strictly foreign issue.