Originally Posted by
percysmith
Stating the markup is a Visa Product & Service Rules requirement.
VP&SR also state cardholders must always have a choice and that DCC is voluntary. As if that rule is always observed.
Important to note that it is only a Visa requirement, MasterCard doesn't require the markup be disclosed, e.g. this receipt from the wikipost in this thread:
http://i.imgur.com/rO75yrlt.jpg