What’s more, despite their marketing, age verification services aren’t foolproof. What about people who have no credit history? Shocking as it seems to most Americans, there are those who don’t use credit. There are recent immigrants who won’t show up in those records, but who are over 18. Just try waving your green card in front of that webcam.For the purposes of a vendor, however, just having a credit or debit card with a billing address and phone number that can be confirmed with the bank actually makes it pretty likely that the purchaser is over 18. The Visa and Amex gift cards that anyone can buy in the grocery store don’t have billing addresses and phone numbers associated with them—or even cardholder names, for that matter.