以下是AMEX客服邮件回复的答案。
Yes, there is a conversion surcharge applied to international charges. We
charge a 2.7% fee after the conversion rate is applied international charges
. International charges processed on or after July 1, 2010, will itemize
this 2.7% amount as a fee on your statement.
Most international charges are converted to US dollars using Interbank rates
as reported by the Reuters information system. The conversion rate used for
a particular date is no greater than the highest official co