Creating urgency is a great way of helping you convert sales. Not only can you let you dynamically generate one-time unique codes for customers, you can also time-limit the codes for maximum effect, creating a sense of urgency around customers converting their sale.
When you create your campaign, just set the duration that you want the generated discount code to be valid for and the plugin will do the rest.
Your discount code will be valid as soon as the email is sent out, but will expire once the selected period has passed – without you having to lift a finger.
Timed discount codes is a Cart Recovery for WordPress Pro feature.