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If you’re not capturing gclid or any click ID at all, you’re basically blind on true attribution.
Closest you can get without forms is stitching via first party data, like matching email or phone collected in store back to platform data uploads. Meta is a bit more forgiving there, Google is stricter unless you pass gclid or enhanced conversions properly.
In tests I’ve run, store visits spike clearly after campaigns, but tying it cleanly to specific clicks without some identifier in the flow is rough. Even a soft capture like storing gclid in local storage and attaching it later makes a big difference.
