Attribution and tracking
Sub-ID tracking
Sub-ID tracking lets a publisher attach an identifier to an affiliate link so results can be grouped by source, placement, campaign or content item. Platforms may call the field a SubID, click reference or tracking ID.
It helps distinguish performance across articles, newsletters, placements or traffic sources.
What to check
Parameter format, allowed characters, reporting delay and whether values appear in reports or postbacks.
Common misconception
Never place personal or sensitive information in tracking parameters. Use non-identifying labels and test before relying on the reports.