Update 2024-01-17: The dedicated Legacy REST API extension is now available in the WordPress.org plugins directory. See the announcement post.
Two months ago we announced that the Legacy REST API will be removed from WooCommerce as of version 9.0. However, for those who have not been able to transition to the more modern REST API based on the WordPress JSON API, we have created an extension which allows you to continue using the WooCommerce Legacy REST API, even after deprecation. The extension is now available as a release in a dedicated GitHub repository.
Who needs to install this extension?
As we mentioned in the original post, we recommend installing and activating the extension immediately if your site has a dependency on the WooCommerce Legacy REST API, so that everything will continue working when you update to WooCommerce 9.0.
To learn more about whether your site has a dependency on the WooCommerce Legacy REST API, checkout the original announcement post.