public function redeem($accountCode) {
    $doc = $this->createDocument();
    $root = $doc->appendChild($doc->createElement('recipient_account'));
    $root->appendChild($doc->createElement('account_code', $accountCode));
    $uri = Recurly_GiftCard::uriForGiftCard($this->redemption_code) . '/redeem';

    $this->_save(Recurly_Client::POST, $uri, $this->renderXML($doc));
  }