The ShipStation In-Cart Delivery Option feature sends shipping rates to Wix to display during checkout.
Delivery Options for Wix Currently in Beta
The In-Cart Delivery Options feature is currently in beta testing for Wix. This means the feature may produce some unexpected results or functionality may change in the future.
After you have set up your In-Cart Delivery Options within ShipStation, log into your Wix account to enable ShipStation to send the delivery options to your store checkout.
To turn on Delivery Options in Wix, go to Settings > Store Shipping.
Click on “Edit Shipping Rule” for the Shipping Region for which you want ShipStation to provide rates:
Scroll down and click the slider next to ShipStation to enable it: