Hi. Why didn't the supermarket take my credit card last night. I gave them my drivers license as well.
Not sure on your nationality but all users of credit/debit cards in Argentina (including locals) need to present government issues identification along with their card. Assuming you are not an Argentine then the cashier will almost always expect your passport and not driving lisences ID cards etc.
If you are having problems try asking them if they need your passport "Necisita mi passporte?"
Hope this helps. almost 7 years ago