Adds catalog line items and/or custom line items to a checkout.
The addToCheckout() function returns a Promise that resolves to the updated checkout when the specified items have been added.
Note: When adding catalog items, options.lineItems.catalogReference is required.
This function requires elevated permissions and runs only on the backend and on dashboard pages.
Checkout ID.
Items to be added to checkout.
There is 1 error with this status code.
This method may also return standard errors. Learn more about standard Wix errors.