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When you finish, a journey that starts on your marketing site and converts on another host still reports the original campaign.

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What carries across a boundary

Identity travels over four bridges. Find your boundary in the left column, and the row tells you what to set up.
Every bridge above is a cookie, a stamped parameter, or a server-side lookup. Don’t put a visitor ID in a URL of your own, because each host issues its own visitor_id.
Two separate registrable domains, such as acme.com and acmeshop.com, share no cookie. The email bridge is the only link between them.

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Set it up

  1. Install the same workspace ID on every domain you control.
  2. Put the campaign parameters on the first landing page only. A second set overwrites the first.
  3. Call identify() with the same internal user_id on every domain.
  4. Turn on Auto-capture email in Settings → Identity & Attribution.
  5. For a Shopify storefront, turn on Stamp cart attributes on the same page.
  6. For a Stripe Payment Link on a custom host, add the host to stripeLinkDomains.
Never install two workspace IDs on one journey. The second workspace issues its own visitor_id, and neither workspace sees the whole path.

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CheckoutChamp funnels

CheckoutChamp funnels bridge by email, so email capture must work on both the storefront and the funnel page.
  1. Add your funnel domains to CheckoutChamp bridge in Settings → Identity & Attribution.
  2. Confirm Auto-capture email is on. Saving the field turns it on for you.
  3. Install the snippet on the funnel pages with data-platform="checkoutchamp".

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Web to app

A browser cookie cannot reach a native app. Use a tracking link instead. See App campaigns.

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Verify

  1. Open a private window.
  2. Land on your site with ?utm_source=crossdomaintest.
  3. Cross every host in the journey once.
  4. Complete a test conversion with a test email address.
  5. Open Conversions and find the row.
  6. Confirm utm_source reads crossdomaintest.

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When it does not work

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Next

  • Identity: how the email bridge picks a touch.
  • First-party tracking: one subdomain that serves script, ingest, and links.
  • Stripe: pass the visitor_id on every Stripe surface.