"Limit one per customer" means one per paying customer. As in one coupon per reciept. Just as when a business will receive limited quanities of something and say "limit one per customer" if one is bent on purchasing that item in mass quantities they have to bring family members or friends along and each buy one seperately. If a family comes through the drive-thru and they put all the food on one order, the family as a unit is considered the customer. If everyone paid separately they're separate customers.
...And I'd never witnessed someone doing multiple orders at a drive thru. In that case, though, it would be ok. I plead ignorance to the fact one could even do that.
I know when I used to cashier for a retail chain, the register would only allow a deduction of one coupon of a certain type per receipt. If the person buying the thing had eight orphaned children with him or her, and wanted to use 8 coupons because they're all separate people they weren't allowed to. The computer would refuse to accept any beyond the first one, resulting in a loss for the business if I overrode it. The computer recognizes # of customers by # of receipts.
In the future, you should probably assume that coupons work that way unless told otherwise. It'll help you avoid conflicts like the one that started this thread.
