This feature is only available when using WooCommerce
The Expire Coupon action allows to automatically disable a coupon when countdown timer runs out, and displays an expiration message each time a user try to apply the coupon code (see image below).
Setting up an Expire Coupon action
Create a coupon under WooCommerce → Coupons or Marketing → Coupons ( Note: Leave the Coupon expiry date fieldempty)
In your HurryTimer campaign settings, click the ExpiryActions tab, select the Expire Coupon from the actions dropdown and choose the coupon code.
3. Save the changes and that's it!
Should I display the timer on checkout or cart page to make it work?
No, displaying the countdown timer on the font side of your website is optional.
Should I need a coupon for each user in the evergreen mode? How does it work?
Only one coupon is needed (which you specified when adding the action). The coupon will expire only for users with expired countdown timer and simultaneously will stay valid for users with running countdown timer.