2. Customer Zone

If the quantity of the product in stock goes down to zero, and the inventory tracking is enabled for this product, the customers will see the notification on the description page in the products catalog. It is also impossible to place an order for out of stock items.

'Out of stock' notification in the Customer Zone

The product amount is updated on the checkout step, not when the products are added to cart.

If a product becomes out of stock during the checkout process (for example, another customer purchased the same item just seconds before) the shopper gets a message saying "Your cart is empty." If it was the only product in the cart. If there were other products in the cart, the checkout process continues, but the product which goes out of stock is deleted from cart.