Gasboy CFN III Manager Manual V3.6 - Manual (Page 304)

Dialout Communications Credit Card Numbering
Page F-2 MDE-4871 CFN III Manager’s Manual for Windows® XP Embedded - Version 3.6 · August 2010
Credit Card Numbering
Credit Cards are identified by the account number prefix (the first digit or digits) and the
number of digits in the account number. For example, VISA credit card account numbers all
start with 4, and they have either 13- or 16-digits.
However, electronic card readers cannot always distinguish a card’s type (for example, Credit
Card, Phone Card, Library Card, or Video Rental Card) just by that card’s magnetically
encoded number. And some of these other special purpose cards, which you certainly do not
want to accept for payment, may even have the same encoded numbers as valid Credit Cards.
Confusion can even occur between different types of Credit Cards.
Consult your bank or card network for current information about the account number prefix
and length.
Handling Transactions
Accepting debit or Credit Cards in transactions usually consists of three parts: authorization
(called verification by Gasboy), data capture, and settlement.