Coupons can be deleted or archived. This depends on whether the coupon has been redeemed or not.

To delete or archive a coupon, select the coupon and then click Delete Coupon.

When you delete a coupon that has no redemptions, the coupon gets completely removed from the system, and it does not appear on the list of coupons either. You can reuse a coupon name to create a new coupon if needed.

Updates: With the recent update, the Coupon Details page is migrated from the default Classic UI to the Leap UI page. The new Leap UI Coupon Details page is designed to provide a more intuitive and efficient user experience, allowing you to easily view and manage coupon details. Refer to this link to know more about the new UI enhancements. Refer to this link for more information. 

Note: 
- Reusing a coupon name and coupon id is only possible if the original coupon has never been redeemed, renamed or completely deleted. If a coupon has been "Archived", the same coupon name/id cannot be re-used.
- You can delete/archive multiple coupons in Chargebee in one-shot. To do this, go to Product Catalog > Coupons, select the coupons to be deleted and click the Delete button that appears above the list.