private function normaliseCard(ThreeDSecureRequest $request)
 {
     $card = $request->getCard();
     if (is_null($card)) {
         return array();
     }
     return array_filter(array('number' => $card->getNumber(), 'expdate' => $card->getExpiryDate(), 'chname' => $card->getCardHolderName(), 'type' => $card->getType(), 'issueno' => $card->getIssueNumber(), 'cvn' => $this->normaliseCVN($card)));
 }