Prestashop back in stock notification extension by knowband makes the customer able to subscribe for the product which is out of stock and the customer is very much interested to purchase it. This addon helps the admin to make sure that the customer requirement must be fulfilled as soon as possible i.e. restock the subscribed products as fast as possible on the online store.
Back in Stock Notification addon allows the customer to sign up for a back in the stock email alert. As soon as the product will be available on the online store the waiting customers are emailed automatically to bring them back to your store so that they can complete their purchase.