Originally Posted by
Im a new user
Inserting the card could alternatively result in signing using your PIN code before you see the receipt. The only safe method is to film the whole transaction and use the film as evidence.
If you tap your card and don't sign anything, how would the merchant prove that you have consented to using DCC if disputed?
Given that fact that the OP user profile posts a location in LA, my reasonable assumption is that the card the OP would use is likely to be a chip-and-signature card. You are correct that there's little recourse for terminals that (improperly) force DCC after a PIN entry.
In the tapped payment scenario, it's just as easy to ask how would you prove that you opted out of DCC?
What should - but probably won't - happen is to require merchants offering DCC to provide a quote slip, which was/is common in some Southeast Asian locations, or a currency selection on the final receipt, which is common in Hong Kong. That would show customer intent for any currency selection and be a valid piece of evidence you could provide to your card issuer if the merchant subsequently forced DCC.