The WooCommerce Legacy API feature used to be required in order for ChannelUnity to function correctly. The ChannelUnity plugin however now works with the default WooCommerce API and the Legacy REST API extension is no longer needed.
If you are installing the ChannelUnity plugin into WordPress for the first time, no further action is required.
If you have been using the ChannelUnity plugin with the Legacy REST API, please get in touch with us via support@channelunity.com and we will convert your account to use the latest/current API endpoints.