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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 every server-side Conversions API event.

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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 alongside server-side events).
  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 over 1–2 weeks as more identified visitors convert.
For a complete walkthrough, see the LinkedIn onboarding guide.