The assumption here is that if this were to catch on as a security mechanism the establishment you're in would clearly advertise their merchant name, or you cou

The assumption here is that if this were to catch on as a security mechanism the establishment you're in would clearly advertise their merchant name, or you could at least ask for it. It wouldn't take that many customers to ask before the guy behind the counter at "Corner Cafe Market" would be able to give you "Culinary Drinkware Inc." as their merchant name offhand.