# SubID Parameter Guide

> Master the subid parameter in affiliate tracking. Learn how subid IDs connect clicks to conversions, enable server-side postback tracking, and preserve attribution when forwarding click data to networks like ClickBank, Awin, or Impact.

In affiliate marketing, a `subid` parameter is a unique identifier that tracks individual clicks and maintains source attribution. The `AnyTrack` Tracking Tag automatically tags your affiliate links with `subid` parameters through AutoTag.

## Tracking Individual Clicks

The `subid` parameter allows you to track each click by appending a unique identifier to your affiliate tracking link. Analyze click attributes like campaign, ad group, ad, and variables.

When running Google Ads campaigns, Google provides a unique `GCLID` (Google Click Identifier) for each click. Use the `subid` parameter to pass this identifier to your affiliate network.

## Maintaining Privacy

Use `AnyTrack` to generate your own unique `clickid` and pass it as the `subid` parameter. This masks your traffic source from the affiliate network while enabling accurate click and conversion tracking.

## Server-Side Tracking (Postback)

The `subid/clickid` parameter is critical for server-side (postback) tracking, which is more reliable than cookie-based tracking. It is not affected by ad blockers, cookie deletion, or browser restrictions.

The `subid/clickid` parameter connects your traffic source to affiliate networks. When a conversion occurs, the affiliate network sends a postback with the `subid/clickid`. Your tracking platform matches the conversion to the original click and attributes it to the correct source.

Using `subid/clickid` for server-side tracking provides accurate campaign performance data and enables data-driven optimization decisions.

## Related Articles

- [Install AnyTrack Tag](/docs/install-anytrack-tag)
- [Event Mapping](/docs/event-mapping)
- [AnyTrack Alternatives](/docs/anytrack-alternatives)