All fix guides

Ad tracking (C3b)

localStorage attribution keys

What this check means

This guide helps you act on one scan finding. It is not legal advice or a compliance verdict.

What to fix

Align capture so localStorage attribution keys are written when that is your designed mechanism.

Step-by-step fix

  1. Confirm your attribution library is configured to use localStorage (Grabber settings or custom script).
  2. Remove security headers or plugins that block script access to localStorage on this origin while testing.
  3. Land with UTMs and inspect localStorage keys.
  4. If you intentionally use cookies only, treat a localStorage miss as expected and rely on C3/C3c — do not invent keys.

Confirm it is fixed

Re-scan and confirm C3b matches your designed storage mechanism.

Rescan this check on your site

Scan the same URL again, then compare this check with your previous report.

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