CREDIT CARD VALIDATION

ERROR 1002

API

EXAMPLE CODE

FAQ

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CREDIT CARD VALIDATION

If you have a secure server (SSL certificate) on your web site and you are bypassing the Connect payment form, you can use this Javascript as a preliminary check for credit cards. The script will prevent the customer from being taken to a LinkPoint page if they enter an invalid credit card.
This script was obtained from Javascript.com

Copy and paste the following code in between the HEAD tags on your HTML page.

Simply click inside the window below, use your cursor to highlight the code, and copy (press Control-C or Apple-C on your keyboard) the code. Next you will need to paste (Control-V or Apple-V on your keyboard) the code into one of your web pages using Notepad (Windows), TextEdit (Mac OS X), or any HTML editor.

<script language = "JavaScript">
<!--

// www.javascript.com
// Credit Card Number Validator Sample Credit Card Validator Scipt
// Date : 04/08/2004
// Uses Linh mod-10 formula to determine the validity and then
// calls different functions to check what category the number belongs
// to.
//******************************************************************** !>

var invalid = "Invalid";
//********************************************************************
// Check the Linh Mod-10 validity

function CheckCreditCardNum(num)
{
var len=num.length;
var first;
var sum=0;
var mul=1;
var i;
var numAtI;
var tempSum;
var theway;
var txtcard;
theway = "";
for(i=(len-1); i >= 0 ;--i)
{
numAtI = parseInt(num.charAt(i));
tempSum = numAtI * mul;
theway += numAtI +" x " + mul +"=" + tempSum;
if(tempSum > 9)
{
first = tempSum % 10;
theway += " => "+ 1 +" + " + first +"=";
tempSum = 1 + first;
theway += tempSum +" ";
}
theway += "\n";
sum += tempSum;

if (mul == 1)
mul++;
else
mul--;
}
theway += "----------\nSum: "+ sum +"\n";


//*********************************************************
// Comment this line if you want to see the calculation


theway = "";
if(sum % 10)
{
if (len == 15)
{
txtcard = CheckFor15(num,0);
if ( txtcard == invalid )
{
alert(theway +"The number: "+ num +" is not valid!! ");
return false;
}
}
else
{
alert(theway +"The number: "+ num +" is not valid!! ");
return false;
}

}

{
switch(len)
{
case 13:
txtcard = CheckFor13(num);
break;
case 14:
txtcard = CheckFor14(num);
break;
case 15:
txtcard = CheckFor15(num,1);
break;
case 16:
txtcard = CheckFor16(num);
break;
default:
txtcard = invalid;
}
if(txtcard == invalid)
{
alert(theway +"The number: "+ num +" is not valid!! ");
return false;
}
else
theway+= "The number: "+ num +" is valid!! \nand it looks like it is: "+ txtcard;
}
//alert(theway);
return true;
}

//***********************************************************************************
// Checks for Visa..
function CheckFor13(number)
{
if(parseInt(number.charAt(0)) == 4 )
return "Visa";
return invalid;
}

//************************************************************************************
// Check for Diners Club
function CheckFor14(number)
{
if( parseInt(number.charAt(0)) != 3 )
return invalid;
if( (parseInt(number.charAt(1)) == 6) || (parseInt(number.charAt(1)) == 8) )
return "Diners Club/Carte Blanche"
if( !(parseInt(number.charAt(1)) ))
if( (parseInt(number.charAt(2)) >= 0) && (parseInt(number.charAt(2)) <= 5))
return "Diners Club/Carte Blanche"
return invalid;
}

//************************************************************************************
// Check for American Express, enRoute, JCB
function CheckFor15(number, chec)
{
if ( (number.charAt(0) == 3) && ( (number.charAt(1) == 4)||(number.charAt(1) == 7) ) && chec)
return "American Express";
var FirstFour = parseInt(number.charAt(0))*1000;
FirstFour += parseInt(number.charAt(1))*100;
FirstFour += parseInt(number.charAt(2))*10;
FirstFour += parseInt(number.charAt(3));
//alert(FirstFour);
if( (FirstFour == 2014) || (FirstFour == 2149) )
return "enRoute";

if( ((FirstFour == 2131) || (FirstFour == 1800)) && chec )
return "JCB";

return invalid;
}

//************************************************************************************
// Check for Visa, MasterCard, Discover or JCB
function CheckFor16(number)
{
var a = parseInt(number.charAt(0));
var b = parseInt(number.charAt(1));
//alert (a);
switch (a)
{
case 5:
if((b > 0)&& (b < 6))
return "MasterCard";
else
return invalid;
break;
case 4:
return "Visa";
break;
case 6:
if ( (b == 0) && ( parseInt(number.charAt(2)) == 1) && ( parseInt(number.charAt(3)) == 1))
return "Discover";
else
return invalid;
break;
case 3:
return "JCB";
break;
default:
return invalid;
break;
}
}


</script>