I've seen some of these checks require credit cards (the networks will tell you if the card you are checking the authorization on is debit or credit). Requiring

I've seen some of these checks require credit cards (the networks will tell you if the card you are checking the authorization on is debit or credit). Requiring a credit would seem to imply an interest in some indirect value of a credit report. It could also just be a way to avoid people using some of the prepaid debit cards you can buy in drug stores, of course, but I think that's still somewhat related to concept of "has credit reportable relationship with a bank".