public static function createCreditCard()
{
$card = new CreditCard();
$card->setType(self::$cardType);
$card->setNumber(self::$cardNumber);
$card->setExpire_month(self::$expireMonth);
$card->setExpire_year(self::$expireYear);
$card->setCvv2(self::$cvv);
$card->setFirst_name(self::$firstName);
$card->setLast_name(self::$lastName);
$card->setId(self::$id);
$card->setValid_until(self::$validUntil);
$card->setState(self::$state);
$card->setPayer_id(self::$payerId);
return $card;
}