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Why does the GA4 purchase event use different property names than the gtag event? 0 Recommended Answers 2 Replies 0 Upvotes
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I'm setting up GA4 ecommerce and noticed that their documentation for the purchase event is different to the general gtag purchase event:


In particular, changes like id to item_id and quantity is missing.

Does this mean I need to fire a separate purchase event for GA4?

To add to my confusion, Google Ads provides two other definition for the purchase event:

https://support.google.com/google-ads/answer/7305793?hl=en-AU&ref_topic=10070037

Shouldn't everyone be on the same page?
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According to the migration guide docs.. if you are using Universal gtag.js.. no need to retag for ecommerce.. GA4 can use the existing tagging
"If you use gtag.js for your UA property, you do not need to add another tag. Your existing ecommerce instrumentation will still work for your GA4 property."


To add to my confusion, Google Ads provides two other definition for the purchase event:

Regarding Google Ads..uses different cookies, and conversion attribution and "stuff" to analytics

If you were using GTM for tag setup, you would need to be using different tags for the google ads stuff.
gtag.js is specifically for google products tracking/conversions, without having to go the full blown GTM route
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Sorry for the slow reply. I never get notifications from this forum. 

I'm developing a tagging app, so would like to work out the best solution. I'm avoiding using the property connection to send the same events for both Universal and GA4. I'm specifying account IDs for all events so can send an event to both if I want.

One concern is that each system defines different properties for the same events. So will the Universal 'purchase' event work for GA4? Does it alter the event parameters as it gets connected across? 

I'm also tagging Google Ads using gtag. They have a beta 'payment' event feature.

My solution at the moment is to send different events to each system via their ID. It means firing more events and some extra bloat/duplication in the code. But it works and is flexible. I still get the advantage of using the one gtag and can control exactly what each ID property receives.
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