Article: Why is Dynamic Currency Conversion Even Legal?

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Some people might like to know straight away how much a service cost in their own currency when purchasing overseas in a foreign currency, and not wait to look at their on-line statement later, in fact a few days later.

My Macquarie Bank debit card app pings the full amount charged in AUD (and local currency too) all but instantaneously if you select local currency when paying. No waiting at all to find out what you paid.