CustomerSyncService returns only changed feeds

[Kimsrung Lov]

Hi there,

I have a question about CustomerSyncService. When sending a request for campaigns changed and feeds changed within CustomerSyncSelector object with both feedIDs and campaignIDs, I always get only feeds changed. And if I send it separately, I get what I expected. However, I don't want to send two requests, what could possibly be?

Moreover, I want to sync feedItems which under campaign, but I get only changed feed ids under changedCampaign response. How could I know which feed items have already been added to or remove from campaign? 

I'm looking to hearing from you. 

Thanks,

Kimsrung