Adds catalog line items to the current site visitor's cart.
Note: This endpoint requires visitor or member authentication.
Catalog line items.
Custom line items. Custom line items don't trigger the Catalog service plugin.
To access and manage custom line items, your app must have the permission scope named "Manage eCommerce - Admin Permissions". Learn more about permission scopes.
Updated cart.
This method doesn’t return any custom errors, but may return standard errors. Learn more about standard Wix errors.