Update sold-out cart items at checkout and tell the customer (Essential Preorder app)
If an item sells out while it sits in a customer's cart, the app can switch it to a preorder at checkout and tell the customer. It also switches a preorder back to a regular item when it comes back in stock.
What the customer sees
- Shopify Plus: checkout updates the item and shows a note under it, with Keep as preorder and Remove.
- Other Shopify plans: Shopify doesn't let apps change items in checkout, so the Thank you page tells the customer the item was ordered as a preorder.
Available on the Professional plan, for "Show preorder when product is out of stock" campaigns.
Step 1: Turn it on
- Open your campaign and go to Offer › Sold out while in cart.
- Tick Update items at checkout and tell the customer and click Save.
Step 2: Add the block (once per store)
Nothing shows until the block is added.
- In Shopify admin, go to Settings › Checkout › Customize, or click Open checkout editor under the checkbox.
- At the top, pick the page: Checkout (Shopify Plus only) or Thank you.

- Click the Apps icon on the left, then the + next to Preorder status notices, and choose the page.

- Check that the block sits under Items in cart in Order summary, then click Save.

On Shopify Plus, add the block to both pages: Checkout and Thank you. On other plans, add it to Thank you.
Can't find something? Use the chat bubble in the app and we will point you to it.