public static function creditCardNumber($type = null, $formatted = false, $separator = '-')
{
if (is_null($type)) {
$type = static::creditCardType();
}
$mask = static::randomElement(static::$cardParams[$type]);
$number = static::numerify($mask);
$number .= Luhn::computeCheckDigit($number);
if ($formatted) {
$p1 = substr($number, 0, 4);
$p2 = substr($number, 4, 4);
$p3 = substr($number, 8, 4);
$p4 = substr($number, 12);
$number = $p1 . $separator . $p2 . $separator . $p3 . $separator . $p4;
}
return $number;
}