Hi @Lina ,
At this time, we are only able to help implement Back in Stock for Shopify and BigCommerce. A Back in Stock option for WooCommerce is a highly requested feature, and I've submitted your feedback to our Product Team so that we can hopefully offer this in future product developments.
While we don't offer this natively for WooCommerce, it's still possible to implement this for your site; however, it would be a custom set up that would require assistance from a developer. We do not assist in this implementation aside from being able to share some documents your developer can reference.
Our Back In Stock feature works by sending an event metric into Klaviyo which triggers a flow. You would need to send the Variant ID, Product ID, and email address. All of this can be custom-built using our open API to work with your website. Here is the necessary documentation for that: How to Set up Custom Back in Stock.
I would also like to note, this would require setting up a custom catalog since WooCommerce’s standard catalog does not include inventory; meaning, Back in Stock cannot be implemented with the standard WooCommerce catalog. Our guide on setting up a Custom Catalog can be found here: Sync a Custom Catalog Feed to Klaviyo.