You can learn more about the algorithm on their webpage, or check out the Null Byte guide on how credit card algorithms work.
A fake number will work for sites that store credit card information to either charge you later or ask you to upgrade.
With our adult dating site you can: I think you get the idea.
There is enough functionality to arrange dates and a free hookup without having to use a credit card.
Validation in particular would be useful if you were accepting credit card payments on your own site and wanted to make sure the cards were legit.
If both the renter with the disability and the authorized driver are between the ages of 21 and 24, an underage surchage will apply. In addition to many uses, there are a myriad of Federal, State and Local ordinances they may restrict the use or may be in conflict.
In order to avoid that rigmarole, you can actually use fake credit numbers instead of your own, and you can do that using the site getcreditcardnumbers.com, which can generate up to 9,999 credit card numbers at a time, or just one. This site merely provides the standard 16 digit credit card number that can be used to bypass certain online forms that only ask for the number.