Lookup NetSuite promotion by coupon code (from custom Magento module)

getNsPromo.php

//assumes you are using the PHPToolKit and have already
// require_once 'lib/NetSuite/NetSuiteService.php';
    private function _getNsPromoCode($magePromoCode){

        $service = new NetSuiteService();

        //get the ID of the coupon by code
        $searchData = new SearchStringField();
        $searchData->operator = "is";
        $searchData->searchValue = $magePromoCode;

        $search = new CouponCodeSearchBasic();
        $search->code = $searchData;

        $request = new SearchRequest();
        $request->searchRecord = $search;

        $searchResponse = $service->search($request);

        if ($searchResponse->searchResult->status->isSuccess) {
            $result = $searchResponse->searchResult->recordList->record;
            $promoId = $result[0]->promotion->internalId;
            return $promoId;
        }
        return null;
    }