In this tutorial, you will learn how to build a purchase (sales) report in GA4 and see details about your purchases such as your transaction IDs, also known as order IDs.
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This way, you can compare & validate your purchase-level data to detect potential issues, such as duplicate conversions.
Here are the steps:
Navigate to your GA4 property and click 'Explore' on the left.
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Go to 'Template Gallery' and click on 'Ecommerce'.
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See the related dimension and import the Transaction ID as seen in the graphic.
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Select the relevant date and remove 'Source' and 'Medium' from 'Rows'.
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Add your Transaction ID in place of the removed items, and you will see your orders on the right.
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It's important to note that some orders might be missing due to a number of reasons such as ad blockers, IOS changes, etc. Therefore, the matching rate is generally around 80%.
If you want to learn more about the transaction ID (order ID) in GA4, here is a more detailed guide for you: How to Find Transaction ID in GA4