Recipe: back in stock emails

This recipe sends shoppers an email when a sold-out variant is restocked, using Klaviyo's back in stock feature. Klaviyo determines when an item is back in stock from its product catalog, and Klaviyo Connect does not send a catalog.

1. Publish a catalog with inventory

Klaviyo's back in stock feature needs a catalog with one item per variant, each with its stock as $inventory_quantity. Set $inventory_policy to 1 on each item: Klaviyo then hides an item at zero stock from product blocks and recommendations, and its back in stock flows use the item. With 0 or 2, Klaviyo keeps showing the item.

Klaviyo records a restock only when it fetches the feed after the stock changes. To keep the feed's stock current, see the Product Feeds documentation. To build the feed, follow the product catalog recipe with a feed of variants.

2. Add a back in stock signup

Shoppers sign up on the product page of a sold-out variant. Klaviyo provides the signup for a custom catalog. To set it up, see Klaviyo's enable back in stock for custom catalog feeds.

The signup identifies the item by its ID in your catalog feed. Pass that ID from your product template. For a feed that uses variant SKUs:

{% if not variant.hasStock() %}
  <div class="back-in-stock" data-catalog-id="{{ variant.sku }}">
    {# Klaviyo's back in stock signup #}
  </div>
{% endif %}

Klaviyo's signup also needs the site's Public API Key, which is the one in the Sites table at Settings -> Plugins -> Klaviyo Connect.

3. Build the flow

In Klaviyo, create a back in stock flow, triggered by Klaviyo's back in stock metric. Klaviyo sends the flow to the shoppers who signed up for an item once the item's $inventory_quantity rises above zero.

Klaviyo's back in stock settings control how soon after a restock it sends the flow, and to how many shoppers at a time.