/**
  * @return array
  */
 protected function serializeCard()
 {
     /** @var $card \Payu\Component\Card */
     $card = $this->request->getCard();
     if (!$card) {
         return array();
     }
     return array('CC_NUMBER' => $card->getNumber(), 'EXP_MONTH' => sprintf('%02d', $card->getMonth()), 'EXP_YEAR' => $card->getYear(), 'CC_CVV' => $card->getCvv(), 'CC_OWNER' => $card->getOwner());
 }