Does buying stuff with amex online make all purchases be paid in USD?
I recently got an Amex card for the first time, and this might be my first online purchase using it. But wWhen I try to buy these items, AliExpress forces the payment into USD instead of CAD. Is this just how AliExpress handles Amex payments, or does Amex always process transactions in USD on any website? And will I be charged a foreign exchange fee?