If this has been dealt with, sorry.

Last week in Iceland I was looking for which key to press to get the charge in ISK when the choice appeared on screen. Clerk had to explain that it was a matter of touching one or the other option directly, no button involved. Usually, we used NFC, but this one transaction seemed to go through as Samsung Pay via swipe slot (had to sign for a $5 coffee even with a PIN card).

On a more pleasant note, these days when I warn folks about DCC costing extra, they are often already aware of the need to choose local, not dollars. Folks may not grasp the details, but they get that in the long run they'll end up paying more that way.