Are we talking about Amazon gift card or credit card? If credit card, are you sure they arent asking for identification number of verifiable source like drivers license or health insurance*? It just dont seem realist to me that you can get a credit card by giving your name, adress and date of birth. But if your sure of that, fine, im glad that its at least verified here in Canada. I had people refused because of false identity. I also had the agency faxing back a demand because the identification number wasnt good and when you would check back with the customer youd notice that you had in fact, written a wrong number on the demand.
Credit card. Driver's license shouldn't be required as not everyone has it. The best you have for a universal identifier for USA citizens is the SSN. The amount of accidental SSN fraud in the USA is actually quite staggering, so intentional would be a breeze really. Fear of being identified solely as a number (due to left over WW2 concerns) when the system was implemented intentionally crippled yhe ability to use it as an identifier.
* Health insurance as a means of identification? You Canadians are so cute. People in the USA are super tough and never get sick, apparently. Consequently our health care system sucks ass, and there is no way to use it to verify anything.