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  • Turn on Enhanced Conversion Tracking in your LinkedIn Insight Tag settings.
  • LinkedIn appends li_fat_id to your landing page URLs on ad clicks.
  • Upstack captures and stores li_fat_id automatically and sends it with every conversion event.
  • No URL changes are required — enabling the setting is enough.
What is li_fat_id?li_fat_id is LinkedIn’s first-party ad tracking click ID. When a member clicks your ad, LinkedIn appends li_fat_id to your landing page URL. It is the strongest match signal LinkedIn supports — events that carry li_fat_id match to campaign data far more reliably than events matched on hashed email or IP alone. Upstack stores the value in a first-party cookie and includes it on the conversion events it reports to LinkedIn through the Insight Tag.

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Prerequisites

Before you start, you need:
  • The LinkedIn Insight Tag installed and active on your storefront
  • Campaign Manager access to your LinkedIn Ads account
  • Your LinkedIn destination already configured in Upstack — see How to configure the LinkedIn destination

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Steps to enable click ID tracking

1

Sign in to Campaign Manager

Sign in to LinkedIn Campaign Manager and select your ad account.
2

Open the Insight Tag settings

Click Data → Signals Manager and open your Insight Tag.
3

Enable Enhanced Conversion Tracking

Turn on Enhanced Conversion Tracking (sometimes labeled First-party ad tracking or Enable click ID).
This setting authorizes LinkedIn to append the li_fat_id parameter to URLs when members click your ads. It does not require any code changes — Upstack reads the parameter automatically.
4

Save the changes

Click Save. The setting takes effect for new ad clicks immediately.
5

Verify the click ID is captured

To confirm li_fat_id is being captured:
  1. Click one of your LinkedIn ads (or open a landing page URL containing li_fat_id=...).
  2. In your browser’s developer tools, check that a first-party cookie storing the LinkedIn click ID is set.
  3. Generate a test conversion and confirm match quality improves in Signals Manager → Signal Diagnostics over the following days.
Example URL after an ad click:

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How Upstack captures the click ID

Once Enhanced Conversion Tracking is enabled:
  1. Member clicks ad → LinkedIn appends li_fat_id=... to the landing page URL.
  2. Upstack Pixel loads → captures li_fat_id from the URL and stores it in a first-party cookie.
  3. Visitor converts → Upstack includes the stored li_fat_id with the conversion event.
  4. Event sent to LinkedIn → LinkedIn matches the conversion to the original ad click for accurate attribution.

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Troubleshooting

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li_fat_id not appearing in URLs

If the click ID isn’t being appended after clicking an ad:
  1. Confirm Enhanced Conversion Tracking is saved and enabled on the Insight Tag.
  2. Verify the Insight Tag is firing on your landing pages (Upstack fires it for you once the destination is configured).
  3. Allow time — the setting applies to new ad clicks, not historical traffic.

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Match quality not improving

If match quality stays low after enabling click ID tracking:
  1. Confirm the Partner ID in Upstack matches the Insight Tag’s Partner ID.
  2. Ensure ads link directly to your storefront so li_fat_id lands in the URL (avoid intermediate redirects that strip parameters).
  3. Match quality builds gradually as more identified visitors convert.
For a complete walkthrough, see the LinkedIn onboarding guide.