I'll do two passes over your code, one to address issues of style, and another to leverage functions from the Haskell Prelude to decrease code length and bring it more in line with typical Haskell usage and idioms.
NET source code - KB Introduction The ultimate credit card utility provides all of the functions you need to validate and test credit cards in your. In addition to the utility class, this project includes complete NUnit tests and a sample website for testing the code.
Background If you have ever tried to process credit cards in your. NET applications, you know that it can be a challenge. Even if you have a good payment processor that provides a.
Stop wasting time trying to piece together a utility class from all of the code snippets scattered across the Internet. I have assembled the "ultimate" credit card utility class that provides robust credit number testing, easy credit card type detection, and functions for testing credit card interfaces in your application.
To top it off, the ultimate credit card utility class also comes with NUnit tests to help guarantee the code always works as expected in your important credit card applications.
NET concepts are used to provide powerful functionality. Using the Code The ultimate credit card utility class can be easily integrated into any. NET project by directly adding the. If you have multiple applications that deal with credit cards, the best approach is to build the credit card utility class into a separate DLLl so that any updates you make in the future can easily be distributed to all of your.
To do that in our utility class, we are going to leverage the power of Regular Expressions and their ability to store matches in named groups. Learning Regular Expressions can be challenging, but great resources exist that help you generate Regular Expression patterns for every situation, such as regexlib.
For our utility, we will use a Regular Expression from RegExLib that validates all major credit cards. Generated by Regex Buddy, this analysis describes in English how each rule in the regex pattern works, and links to online help explaining each rule.
With our regex pattern in hand, we can now take any credit card number and determine its type. Why not access the Luhn test directly to validate credit cards?
While the Luhn formula will validate that numbers appear in the correct order, it will not validate that a card is of the correct type. That will save you from the repetitive task of manually entering valid test data when developing your application.
When your application runs in production, this test should be turned-off and only customer credit card numbers should be accepted.
Visa Return " " Case Else Return Nothing End Select End Function Testing the Utility Any code that is going to be supporting transactions as important as processing credit cards should have a complete set of tests to ensure the code is working as expected.
As such, the ultimate credit utility comes with a comprehensive set of NUnit tests that can be added to your regular testing routines. Covering the ins and outs of creating NUnit tests is not in the scope of this article, but here is a sample NUnit test for this utility class that tests the IsValidNumber function.
The site CSS has been optimized for Firefox, but it is usable in any modern browser. To add an extra level of interactivity to the demo application, trial versions of the Telerik RadControls have been used for masked input and AJAX.
The trial version of the controls can be freely used in demo applications, but a periodic trail message will appear on a random number of page loads. For more information on the commercial version of RadControls, visit http: The ultimate credit card utility class provides all of the basic functions you need to validate credit card numbers before you pass them along to your processor.
The utility cannot absolutely guarantee that a number is a real credit card number before it is processed, but it can eliminate most card input errors and enable you to reduce trips to your payment processor.
Hopefully, you will find this utility helpful and it will save you time on your next credit card application.The MOD 10 calculation is a checksum (recognition of mistakes) equation which is the basic name for the Luhn calculation.
This equation has been being used to approve a considerable measure of recognizable proof numbers other than charge cards since its improvement by researcher Hans Peter Luhn from IBM.
An initial thought would be to create an audit template using the 10 Cs and assess the supplier on each "C" using a rating scale. This is a great question and others may have ideas to share. May I suggest that you start a new post over on the Forums.
The Luhn algorithm, also known as the modulus 10 or mod 10 algorithm, is a simple checksum formula used to validate a variety of identification numbers, such as credit card numbers, IMEI numbers, Canadian Social Insurance Numbers. The LUHN formula was created in the late s by a . It uses the Luhn-algorithm, aka.
IBM MOD Stack Exchange Network. Calculating Luhn-algorithm checksum digit. up vote 19 down vote favorite. This is a handy shortcut and much preferable to writing c:cs all over the place if you need both the original value and its decomposition.
Download sample - KB; Introduction. The purpose of this article is to learn about some of the most common identification numbers and check digit algorithms involved in the verification of these identification numbers. That will generate 10 when sum is already a multiple of Basically you're just trying to round up.
Basically you're just trying to round up. Here's an easy way of doing it.