I know this is probably not a Wix Code issue, but I didn't find anywhere else to provide this feedback. There needs to be an optional apartment/unit number field in the checkout for Wix Stores. We're not able to add that, and many of our users don't realize they need to include their apartment number when they checkout (since it doesn't say they should, and there is no field for it). It's kind of a big problem with an easy solution (just add the optional field).
Hope someone on the Wix team sees this and can add it to their queue.