currently happening a lot in restaurants in europe
at the time you pay, you are offered the "choice" of paying in EUR or USD
supposedly, you will be happier not being subject to possible exchange
rate variations, and knowing that you have a fixed bill in USD
what nobody tells you that the exchange rate they use is atrocious
(to the benefit of the restaurant and visa - amex forbids the practice)
so the 100EUR dining, would have converted to USd114 if paid in EUR
however, with this system it converts to USD125, AND YOU SIGN THE
BILL FROM THE CREDIT CARD POS in USD. - so that is the ammount'
you accepted without noticing. ....