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osCommerce cvv2 validation field

littletipi asked
Last Modified: 2012-05-05
I have osCommerce installed on my webserver but i need to make a modification.
I have modified the cc.php payment module and did this

 '    if (cc_cvv2 == "" ) {' . "\n" .
            '      error_message = error_message + "' . MODULE_PAYMENT_CC_CVV2_ERROR . '";' . "\n" .
            '      error = 1;' . "\n" .
            '    }' . "\n" .
 '    if (cc_cvv2.length < 3 || cc_cvv2.length > 4 ) {' . "\n" .
            '      error_message = error_message + "' . MODULE_PAYMENT_CC_CVV2_ERROR_LENGTH . '";' . "\n" .
            '      error = 1;' . "\n" .
            '    }' . "\n" .

It works fine but it just checks if cvv2 field is empty and checks cvv2 min and max length.
i still need if someone gives as Credit Card Type
Visa Master or any other cvv2 Length should be 3
but if someone gives American Express as Credit card type cvv2 length should be 4
So i mean if someone chose American Express as credit card type and gives just 3 numbers it should display error for example:

 define('MODULE_PAYMENT_CC_CVV2_ERROR_AMEX', 'American Express cvv2 should be 4 characters long!');

but if someone chose other card types like visa it should allow just 3 characters not more so if someone gives 2 or 4 it should display error Cvv2 Should be 3 characters long.

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