@taiwan_girl
In the signature spot on the back of the credit card, I used to write "please ask for ID" rather than a signature. In some places, credit card stealing is a big deal, so tried to avoid that happening.
You have now jogged my memory…
come to think of it, that is exactly what the bank’s were advising and I accordingly did when I received the new card. That instruction on the back of the card is what triggered the clerk and his supervisor.