This feature is only available with Preorder Pro + Back in Stock, the previous version of the Magical Preorder app.
To let customers sign up for back in stock alerts:
In the app, click Home from the left-hand menu.
Find the product you want to set up:
Use the search bar to find a product
Or increase the entries per page at the top left to see more products
Toggle Notify Me to turn on back in stock alerts.
(Optional) Select a Product Availability Date to let customers know when the item is expected back.
Click Save in the top-right corner.
Customers will now see a “Notify Me” option when the product is out of stock.