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.
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.
Go to 'Template Gallery' and click on 'Ecommerce'.
See the related dimension and import the Transaction ID as seen in the graphic.
Select the relevant date and remove 'Source' and 'Medium' from 'Rows'.
Add your Transaction ID in place of the removed items, and you will see your orders on the right.
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