Is there a way to track which orders have used coupon codes?
There isn't a direct report for coupon codes used. However, you can use the export orders report to find this data. The export orders report will display the coupon code that was used to reduce an order amount. You can enable the "Coupon" column within the settings section of the export orders feature to see coupon codes used in orders after you run the report. You will need to filter the CSV file in order to get the data you need for your analysis. For example, filter the Coupon column to show you the orders that used a specific coupon code. You can read more about the export orders feature here: Exporting Orders.