public static function isCardNumberValid($param)
	{
		$isValid = false;

		if(isset($param['number'])) {

			$errorIsEmpty = CheckoutApi_Lib_Validator::isEmpty($param['number']) ;
			
			if(!$errorIsEmpty) {
				//$this->logError(true, "Card number can not be empty.", array('card'=>$param),false);
				$isValid = true;
			}

		} 

		return $isValid;
	}