Click the form. See where leads came from.

Rules match against Google Analytics 4 session dimensions from the standard Data API — MarStack does not read utm_* parameters from landing URLs directly.

Each condition compares your value to what GA4 has already stored on the session:

• Session source — GA4 sessionSource (often from utm_source, but GA may use its own default)
• Session medium — GA4 sessionMedium (often from utm_medium)
• Campaign — GA4 sessionCampaignName (often from utm_campaign, but can also come from Google Ads auto-tagging or show as (not set))
• Channel group — GA4 default channel group (e.g. Paid Search, Email)
• Landing page (+ query) — first landing page path in the session
• Referring page URL — referrer on the hit

To sanity-check a rule, open Explore in GA4, add the same dimension (e.g. Session campaign), and filter to your value. Totals should align with your date range and metric on Data Hero.