public static function binaryBatch(Api\MtBatchBinarySmsCreate $batch)
    {
        $fields = Serialize::_createBatchHelper($batch);

        $fields['type'] = 'mt_binary';
        $fields['body'] = base64_encode($batch->getBody());
        $fields['udh'] = bin2hex($batch->getUdh());

        return Serialize::_toJson($fields);
    }