Creates a checkout from a cart.
The createCheckout() function returns a Promise that resolves to the new checkout's ID when it's created.
If a checkout was already created from the specified cart, that checkout will be updated with any new information from the cart.
Note: options.channelType is a required field.
Cart ID.
Checkout creation options.
This method doesn’t return any custom errors, but may return standard errors. Learn more about standard Wix errors.