1. Navigate to Commerce > eCommerce
  2. Hover over your store name and click Reports
  3. In the dropdown box select Misc: ECommerce Order Summary Report
  4. Click Run Report
  5. On the next page you have the option to set a date range and apply any filters that are necessary
  6. Click Next
  7. Mark the checkbox for "Discount Code"
  8. Click Finish
  9. Mark the radio button for "No - Run the report immediately and wait for it to complete."
  10. Click Run Report