Credit Card Validation Code
Hi folks,
Does anyone have a well-tested code to validate credit card information? Any help would be greatly appreciated.
Jazon
Does anyone have a well-tested code to validate credit card information? Any help would be greatly appreciated.
Jazon
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Most Credit Card processing services already have a CC validator in their code, if you use a company like iBill it's already there.
Nice code hongjun.
Nice code hongjun.
Listening...
>>Nice code hongjun
I got it somewhere and I forgot about the link and so got to post the entire code here.
Anyway most companies might even have their own validator already. Either in the form of a dll or anything. Ask for it. But if you are doing for your own project, then you might need my above code.
hongjun
I got it somewhere and I forgot about the link and so got to post the entire code here.
Anyway most companies might even have their own validator already. Either in the form of a dll or anything. Ask for it. But if you are doing for your own project, then you might need my above code.
hongjun
Yeah, most of the processing companies already have a validator, the web store doesn't have to worry about it in most cases, unless they are doing their own processing...
Its called a Luhn check and there plenty of efficient code at
http://www.beachnet.com/~hstiles/cardtype.html
http://www.beachnet.com/~hstiles/cardtype.html
Nice info deestuar, to bad all the links are dead or point to no such code...
In that case heres the info from that invalid link.
Credit Card Validation - Check Digits
This document outlines procedures and algorithms for Verifying the accuracy and validity of credit card numbers. Most credit card numbers are encoded with a "Check Digit". A check digit is a digit added to a number (either at the end or the beginning) that validates the authenticity of the number. A simple algorithm is applied to the other digits of the number which yields the check digit. By running the algorithm, and comparing the check digit you get from the algorithm with the check digit encoded with the credit card number, you can verify that you have correctly read all of the digits and that they make a valid combination.
Possible uses for this information:
When a user has keyed in a credit card number (or scanned it) and you want to validate it before sending it our for debit authorization.
When issuing cards, say an affinity card, you might want to add a check digit using the MOD 10 method.
1.Prefix, Length, and Check Digit Criteria
Here is a table outlining the major credit cards that you might want to validate.
CARD TYPE Prefix Length Check digit algorithm
MASTERCARD 51-55 16 mod 10
VISA 4 13, 16 mod 10
AMEX 34
37 15 mod 10
Diners Club/
Carte Blanche 300-305
36
38 14 mod 10
Discover 6011 16 mod 10
enRoute 2014
2149 15 any
JCB 3 16 mod 10
JCB 2131
1800 15 mod 10
2. LUHN Formula (Mod 10) for Validation of Primary Account Number
The following steps are required to validate the primary account number:
Step 1: Double the value of alternate digits of the primary account number beginning with the second digit from the right (the first right--hand digit is the check digit.)
Step 2: Add the individual digits comprising the products obtained in Step 1 to each of the unaffected digits in the original number.
Step 3: The total obtained in Step 2 must be a number ending in zero (30, 40, 50, etc.) for the account number to be validated.
For example, to validate the primary account number 49927398716:
Step 1:
4 9 9 2 7 3 9 8 7 1 6
x2 x2 x2 x2 x2
--------------------------
18 4 6 16 2
Step 2: 4 +(1+8)+ 9 + (4) + 7 + (6) + 9 +(1+6) + 7 + (2) + 6
Step 3: Sum = 70 : Card number is validated
Note: Card is valid because the 70/10 yields no remainder.
The great folks at ICVERIFY are the original source of this data, I only formatted it in HTML.
If you are in the market, I wrote a set of FoxPro modules for Windows/Dos that interface nicely with ICVERIFY in a multi-user LAN setup. You just set up ICVERIFY on a single station, and all stations on the LAN can authorize credit cards with a single FOXBASE function call. Of course, you have to license ICVERIFY by the node, but it is very reasonable. I also wrote a couple of simple functions to perform pre-authorization, card screening, etc.
Here is a Microsoft Excel worksheet that will validate a number for you (useful for understanding the algorithm, it is in a .ZIP compressed format)
Eliot Jackson has written a set of VB 4 routines here.
Horace Vallas made a NeoWebScript (Tcl really) procedure that implements it.
Check it out at https://enterprise.neosoft.com/secureforms/hav/
Because I get at least a letter a week regarding this routine, here are some additional helpful notes:
Make sure that you:
have started with the rightmost digit (including the check digit) (figure odd and even based upon the rightmost digit being odd, regardless of the length of the Credit Card.) ALWAYS work right to left.
the check digit counts as digit #1 (assuming that the rightmost digit is the check digit) and is not doubled
double every second digit (starting with digit # 2 from the right)
remember that when you double a number over 4, (6 for example) you don't add the result to your total, but rather the sum of the digits of the result (in the above example 6*2=12 so you would add 1+2 to your total (not 12).
always include the Visa or M/C/ prefix.
E-Mail me at: hstiles@beachnet.com
Also, visit my home page or my POS page.
Last revised: 2/25/97
Credit Card Validation - Check Digits
This document outlines procedures and algorithms for Verifying the accuracy and validity of credit card numbers. Most credit card numbers are encoded with a "Check Digit". A check digit is a digit added to a number (either at the end or the beginning) that validates the authenticity of the number. A simple algorithm is applied to the other digits of the number which yields the check digit. By running the algorithm, and comparing the check digit you get from the algorithm with the check digit encoded with the credit card number, you can verify that you have correctly read all of the digits and that they make a valid combination.
Possible uses for this information:
When a user has keyed in a credit card number (or scanned it) and you want to validate it before sending it our for debit authorization.
When issuing cards, say an affinity card, you might want to add a check digit using the MOD 10 method.
1.Prefix, Length, and Check Digit Criteria
Here is a table outlining the major credit cards that you might want to validate.
CARD TYPE Prefix Length Check digit algorithm
MASTERCARD 51-55 16 mod 10
VISA 4 13, 16 mod 10
AMEX 34
37 15 mod 10
Diners Club/
Carte Blanche 300-305
36
38 14 mod 10
Discover 6011 16 mod 10
enRoute 2014
2149 15 any
JCB 3 16 mod 10
JCB 2131
1800 15 mod 10
2. LUHN Formula (Mod 10) for Validation of Primary Account Number
The following steps are required to validate the primary account number:
Step 1: Double the value of alternate digits of the primary account number beginning with the second digit from the right (the first right--hand digit is the check digit.)
Step 2: Add the individual digits comprising the products obtained in Step 1 to each of the unaffected digits in the original number.
Step 3: The total obtained in Step 2 must be a number ending in zero (30, 40, 50, etc.) for the account number to be validated.
For example, to validate the primary account number 49927398716:
Step 1:
4 9 9 2 7 3 9 8 7 1 6
x2 x2 x2 x2 x2
--------------------------
18 4 6 16 2
Step 2: 4 +(1+8)+ 9 + (4) + 7 + (6) + 9 +(1+6) + 7 + (2) + 6
Step 3: Sum = 70 : Card number is validated
Note: Card is valid because the 70/10 yields no remainder.
The great folks at ICVERIFY are the original source of this data, I only formatted it in HTML.
If you are in the market, I wrote a set of FoxPro modules for Windows/Dos that interface nicely with ICVERIFY in a multi-user LAN setup. You just set up ICVERIFY on a single station, and all stations on the LAN can authorize credit cards with a single FOXBASE function call. Of course, you have to license ICVERIFY by the node, but it is very reasonable. I also wrote a couple of simple functions to perform pre-authorization, card screening, etc.
Here is a Microsoft Excel worksheet that will validate a number for you (useful for understanding the algorithm, it is in a .ZIP compressed format)
Eliot Jackson has written a set of VB 4 routines here.
Horace Vallas made a NeoWebScript (Tcl really) procedure that implements it.
Check it out at https://enterprise.neosoft.com/secureforms/hav/
Because I get at least a letter a week regarding this routine, here are some additional helpful notes:
Make sure that you:
have started with the rightmost digit (including the check digit) (figure odd and even based upon the rightmost digit being odd, regardless of the length of the Credit Card.) ALWAYS work right to left.
the check digit counts as digit #1 (assuming that the rightmost digit is the check digit) and is not doubled
double every second digit (starting with digit # 2 from the right)
remember that when you double a number over 4, (6 for example) you don't add the result to your total, but rather the sum of the digits of the result (in the above example 6*2=12 so you would add 1+2 to your total (not 12).
always include the Visa or M/C/ prefix.
E-Mail me at: hstiles@beachnet.com
Also, visit my home page or my POS page.
Last revised: 2/25/97
No.... the links on that page are dead. That page loads fine.
what links are dead I have tried some and they appear to work. What do you want ? Do you want some code i have seen javascript versions before ?
Stu
Stu
Click on the VB4 (?) routines link, and the script at NeoWebScript is nowhere to be found.
I already have code thanks.
I already have code thanks.
piratepatrol,
so any progresses?
hongjun
so any progresses?
hongjun
http://www.aspin.com/func/content-search?id=2332510
hongjun