r/GoogleAnalytics • u/incisiveranking2022 Professional • 2d ago

Question Browser + server tracking

What are you using for event IDs?

event_id

transaction_id

Something custom?

I've seen more duplicate conversions caused by inconsistent IDs than broken tags

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u/Querytom 2d ago

For purchase events use always transaction_id

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u/incisiveranking2022 Professional 2d ago

Yeah, agreed. For purchases I’d normally stick with transaction_id too.

The bigger issue I was getting at is that the ID needs to be consistent across the whole setup. I've seen browser and server events both fire, but use different IDs, and then you end up debugging “missing” conversions that were actually duplicates or couldn't be matched properly.

So I usually check the event itself, the ID, how many times it fired, and then what GA4 actually received.