private static function createSitelinksCampaignFeed(
        AdWordsServices $adWordsServices,
        AdWordsSession $session,
        array $sitelinksData,
        $campaignId
    ) {
        $campaignFeedService =
            $adWordsServices->get($session, CampaignFeedService::class);
        $matchingFunctionString = sprintf(
            'AND( IN(FEED_ITEM_ID, {%s}), EQUALS(CONTEXT.DEVICE, "Mobile") )',
            implode(',', $sitelinksData['sitelinkFeedItemIds'])
        );

        // Create a campaign feed and its feed function.
        $campaignFeed = new CampaignFeed();
        $campaignFeed->setFeedId($sitelinksData['sitelinksFeedId']);
        $campaignFeed->setCampaignId($campaignId);

        $matchingFunction = new MatchingFunction();
        $matchingFunction->setFunctionString($matchingFunctionString);
        $campaignFeed->setMatchingFunction($matchingFunction);
        $campaignFeed->setPlaceholderTypes([self::PLACEHOLDER_SITELINKS]);

        // Create the campaign feed operation.
        $operation = new CampaignFeedOperation();
        $operation->setOperand($campaignFeed);
        $operation->setOperator(Operator::ADD);

        // Create the campaign feed on the server and print out some information.
        $result = $campaignFeedService->mutate([$operation]);
        foreach ($result->getValue() as $savedCampaignFeed) {
            printf(
                'Campaign with ID %d was associated with feed with ID %d.%s',
                $savedCampaignFeed->getCampaignId(),
                $savedCampaignFeed->getFeedId(),
                PHP_EOL
            );
        }
    }