What is Sub-ID Tracking?
Definition
A method affiliates use to append custom identifiers to their tracking links so they can pinpoint which traffic source, page, or creative generated each conversion. Sub-IDs are essential for scaling campaigns profitably.
Related Terms
A server-to-server callback that fires when a conversion occurs, passing transaction details to the affiliate's tracking platform. Postbacks are more reliable than pixel-based tracking because they are not affected by browser privacy restrictions.
The length of time a tracking cookie remains active after a user clicks an affiliate link. Longer cookie windows (30, 60, or 90 days) give affiliates credit for purchases that happen days or weeks after the initial click.
The average revenue an affiliate earns per click sent to an offer. EPC is calculated by dividing total commissions by total clicks and is the primary metric for comparing offer profitability across different networks.