Currently, applying a discount code requires three clicks and opens a separate pop-up modal from the summary screen. Many of our registrants miss the "Add Discount" link entirely and struggle to apply their codes.
We would love to see an open, inline discount code field right on the primary checkout/summary screen rather than hidden behind a modal link. Additionally, having the ability to automatically apply public discount codes (via URL parameter, date, or ticket selection) would significantly improve the user experience and reduce support inquiries.