TikTok pixel events now list every product they carry. A contents list becomes one product per item, including when that list arrives as text. If there is no usable contents list, each id in content_ids is listed instead.
An id sent only as the singular content_id parameter is not listed, and the properties used for spec checks are unchanged.
Who it is for: ecommerce teams that check what TikTok receives for each product, not only that the event fired.
Where: every TikTok pixel event, in the hits and in the schema. More on what Trackingplan reads from ad platforms: Coverage.