Most campaigns allow subids, most importantly SubID1, to be passed back to the marketer.
Passing subids back to the marketer is very important in the long-term optimization and scaling of your campaigns. In the case that your traffic isn't backing out for the advertiser, they will be able to pinpoint the individual subids that aren't performing (sources, targets, keywords, etc) and request that you remove those subids from your campaign, rather than having you be pulled off the offer completely. This will help the marketer to be profitable as well as increase your overall quality and stability on the offer.
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