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Offline conversions for retail
Posted by on April 24, 2026 at 3:24 amRight I'm slightly confused here. Running google and meta ads. What happens a lot is people see my ads and have a good look around my website. They then jump in the car and come purchase from instore where I collect a whole bunch of data off them to open an account.
My questions is I don't capture the gclid anywhere so is there anyway to associate their purchase to their click without having to get them to fill in some kind of form?
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1 Reply
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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.
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exactly as stovetopmuse said, you must store gclid at least for 90 days for attribution, it’s all ok to do as well, GDPR and so whatever,
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You can push offline conversions with first party data but make sure you at least have email, phone or both via API or some other method, e.g. csv upload.
Match rate will be lower without gclid (not everyone has google account or is logged in when seeing your ad), but 50% is better than zero.
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Without GCLID, clean 1:1 click attribution is mostly gone. Google’s offline imports rely on GCLID or enhanced conversions using hashed first-party data captured on-site. For retail, upload store sales/customer data if eligible… but don’t expect magic matching from anonymous site visits. Start capturing GCLID/user data now.
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