Known as dynamic currency conversion, it's a trap. (creditwalk.ca)
Although this not technically a tourist scam, dynamic currency conversion is something to watch out for since you can get ripped off. (moneysense.ca)
This may be a significant change for some Westpac cardholders that use their cards overseas, and allow the merchant to charge them in Australian currency, using a process known as Dynamic Currency Conversion (DCC). (austravelpoints.com)