What I want in the end is the following: a client comes to the store, sees all the products, then if the product is not in stock, he can leave his email and get notification when the product will be available.
If it's not possible then how can I make the products appear for clinents even when they are not available in my warehouse (quantity=0)? Because now when I have in stock quantity = 0, the product doesn't appear in the catalog.
