Almost all institutions that create and require unique account or identification numbers use the Mod 10 algorithm.
There are also some criteria that need to be checked in order to ensure that certain types of cards have certain lengths and prefixes or leading digits.
Although online payment options such as Pay Pal have become extremely popular in the last couple of years, the majority of online stores still use some sort of merchant system to accept credit card payments from their Websites.
If doubling a digit results in a number higher than 10, add the two digits of the new number together and write that result on your list. Research the extent of the verification each website can provide.
For example, if the digit on the card is seven, doubling it would result in 14. You will only receive confirmation that the card number is valid, not that there is credit available on the card. Her areas of expertise are business, law, gaming, home renovations, gardening, sports and exercise.
Almost all credit card companies use the same method for generating card numbers.
In this method, the last digit of the card number is a checksum.
Credit card numbers are generated according to a specific set of rules.
This gives merchants a way to verify the validity of a card number prior to accepting the customer's payment.
As well as passing the Mod 10 algorithm, a credit card number must also pass several different formatting rules.
A list of these rules for each of the six most popular credit cards is shown below: As mentioned earlier, in this article we will create a PHP class that will hold the details of a credit card number and expose a function that indicates whether or not the number of that credit card is valid (i.e. Before we create that class however, let’s look at how the Mod 10 algorithm works.
The other digits are generally used to identify the card company, the financial institution that issued the card, the customer account number, etc.