As of version WooCommerce 9.0, the legacy API feature is moving to a separate extension. Installation of this extension is required in order for ChannelUnity to function correctly. The ChannelUnity plugin will evolve to work with the default WooCommerce API in the future, however for now the Legacy REST API extension is needed.

For more information see the following article. https://developer.woocommerce.com/2023/10/03/the-legacy-rest-api-will-move-to-a-dedicated-extension-in-woocommerce-9-0/

If you need help setting up this extension or have unexpected behaviour after installing it please contact our support team at support@channelunity.com.