private function _convertCreateSubscription($request) {

        $parameters = array();
        $parameters['Action'] = 'CreateSubscription';
        if ($request->isSetSellerId()) {
            $parameters['SellerId'] =  $request->getSellerId();
        }
        if ($request->isSetMWSAuthToken()) {
            $parameters['MWSAuthToken'] =  $request->getMWSAuthToken();
        }
        if ($request->isSetMarketplaceId()) {
            $parameters['MarketplaceId'] =  $request->getMarketplaceId();
        }
        if ($request->isSetSubscription()) {
            $SubscriptionCreateSubscriptionInput = $request->getSubscription();
            foreach  ($SubscriptionCreateSubscriptionInput->getNotificationType() as $NotificationTypeSubscriptionIndex => $NotificationTypeSubscription) {
                $parameters['Subscription' . '.' . 'NotificationType' . '.'  . ($NotificationTypeSubscriptionIndex + 1)] =  $NotificationTypeSubscription;
            }
        }

        return $parameters;
    }