Coupon codes are some of the common ways to boost the eCommerce sales. If you are a Magento 2 store owner, you can easily create cart price rules in the backend and generate coupon codes to offer discounts to the customers. Distributing coupon codes and running campaigns is not as easy as it may seem. There are many challenges associated with it. In Magento 2, the coupon codes are generated for only-time use and can not be re-used by the customers, which is a good thing to avoid over discounts. But, what if the customer cancels the order and decide to use the same coupon code again for another order? Magento 2 does not have any default functionality to restore the coupon code after the order cancellation. Therefore, the merchant may require to opt for the programmatic way to restore coupon code after order cancellation in Magento 2.