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Check Credit Card Validity in ASP
By: Lee A. Shurie
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| Subject: |
eCommerce |
| Language: |
ASP |
| Rating: |
Rated 56 times. Rate or review this item: 1 2 3 4 5
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See it in action
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Information
This routine was actually written by someone else but didn't work right so I modified it. It is a very simple credit card verification routine which simply applies the Mod 11 algorithm to check whether the card number is among the universe of valid numbers. It does not check to see if the number has been issued to a person, if there is a balance in the account, and so on. It also doesn't check the expiration date (I have several methods for checking expiration dates - which are posted on this site).
This routine is very useful as a pre-check before submitting customer data to a credit card gateway.
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Code
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Instructions
Simply paste the function in an ASP page anywhere you like (as long as it is between the <% %> ASP delimiters).
To call the function simply use:
isCreditCard("1234567812345678")
or
myCreditCardNumber = "1234567812345678"
isCreditCard(myCreditCardNumber)
The function will return true or false. So, for example…
varTransactionSuccessful = isCreditCard("1234123412341234")
If varTransactionSuccessful Then
--- some processing goes here
End If
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Keywords:credit card verification, validate credit card, eCommerce, asp
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