I'm probably missing something simple here, but didn't see anything else about it in the forums. We've had a couple issues pop-up where customers have included categories in their orders that don't exist in their store setup. Each time it's taken us a good bit to debug because it doesn't result in any errors in the js response.
This prompted us to add checks to make sure the category exists before an item is added to a cart, but wondered if there was something we were missing in the FC response that indicates an illegal category is being used. Anyone with suggestions for a good way to handle category validation?