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.
Checkout ID.
Items to be added to checkout.
This method doesn’t return any custom errors, but may return standard errors. Learn more about standard Wix errors.