Long known to frequent travelers, a questionable practice called dynamic currency conversion is catching more attention from bank card issuers and their clients. While the practice borders on insidious, travel professionals can protect their organizations with a little education.

Bank sources said the activity — in which merchants ask foreign travelers whether they'd like charges in their home currency, only to levy unnecessary extra conversion fees — has slowly grown since emerging a few years ago. It's now commonplace even . . .

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