public function isRegistered(array $array)
    {
        $this->formatRequest($array);
        $WSRequest = array(
            'payment'           => $this->payment($array['payment']),
            'order'             => $this->order($array['order']),
            'privateDataList'   => $this->privateData,
            'buyer'             => $this->buyer($array['buyer'], $array['shippingAddress'], $array['billingAddress']),
            'miscData'          => $array['miscData']
        );
        return $this->webServiceRequest($array, $WSRequest, self::DIRECT_API, 'isRegistered');
    }