Sign Up ›
  • Heath Long.ax1336
  • NEWBIE
  • 0 Points
  • Member since 2012
  • Chatter
    Feed
  • 0
    Best Answers
  • 0
    Likes Received
  • 0
    Likes Given
  • 0
    Questions
  • 1
    Replies
2 replies

Apex Class: Credit Card Format Validation (Not Payment Verfication)

Here is a class for validating credit card formats for 4 major cards.
 
Method isValid returns boolean.   See test method for call examples.
 
public with sharing class CreditCardValidation {
public Boolean isValid(String CardType, String CardNumber)
{
CardNumber = CardNumber.replace(' ','');
Boolean ret = false;
if(CardType=='MasterCard')
{
ret = true;
//prefix: 51->55
ret = ret && (checkPrefix(CardNumber, '51') || checkPrefix(CardNumber, '55'));
//length: 16
ret = ret && CardNumber.length()==16;
//mod 10
ret = ret && checkMod10(CardNumber);
}
if(CardType=='American Express')
{
ret = true;
//prefix: 34 or 37
ret = ret && (checkPrefix(CardNumber, '34')
|| checkPrefix(CardNumber, '35')
|| checkPrefix(CardNumber, '36')
|| checkPrefix(CardNumber, '37'));
//length: 15
ret = ret && CardNumber.length()==15;
//mod 10
ret = ret && checkMod10(CardNumber);
}
if(CardType=='Discover')
{
ret = true;
//prefix: 6011
ret = ret && checkPrefix(CardNumber, '6011');
//length: 16
ret = ret && CardNumber.length()==16;
//mod 10
ret = ret && checkMod10(CardNumber);
}
if(CardType=='Visa')
{
ret = true;
//prefix: 4
ret = ret && checkPrefix(CardNumber, '4');
//length: 13 or 16
ret = ret && (CardNumber.length()==16 || CardNumber.length()==13);
//mod 10
ret = ret && checkMod10(CardNumber);
}
return ret;
}
private Boolean checkPrefix(String CardNumber, String Prefix)
{
return CardNumber.startsWith(Prefix);
}
private Boolean checkMod10(String CardNumber)
{
//first check if all digits are numeric
if(!pattern.matches('[0-9]+',CardNumber)) return false;
String s = '';
Integer digit = 0;
for(Integer d=CardNumber.length()-1; d>=0;d--)
{
digit++;
if(Mod(digit,2)==0)
{
Integer i = Integer.valueOf(CardNumber.substring(d,d+1))*2;
s+=i.format();
}
else
{
Integer i = Integer.valueOf(CardNumber.substring(d,d+1));
s+=i.format();
}
}
Integer sum = getSum(s);
system.debug('s:'+sum);
system.debug('sum:'+s);
return Mod(sum,10)==0;
}
private Integer getSum(String s)
{
Integer sum = 0;
for(Integer d=0; d<s.length();d++)
{
sum+=Integer.valueOf(s.substring(d,d+1));
}
return sum;
}
public Integer Mod(Integer n, Integer div)
{
while(n>=div)
n-=div;
return n;
}

    static testMethod void test() 
    {
CreditCardValidation cc = new CreditCardValidation();
system.debug('visa:'+cc.isValid('Visa','4111 1111 1111 1111'));
system.debug('MasterCard:'+cc.isValid('MasterCard','5500 0000 0000 0004'));
system.debug('American Express:'+cc.isValid('American Express','3400 0000 0000 009 '));
system.debug('Discover:'+cc.isValid('Discover','6011 0000 0000 0004'));
    }
}