Yeah, this is very annoying (filed FB12010677 about it). We use URL(string: "x-apple.systempreferences:com.apple.preference.notifications")! which gets you pretty close — the user still has to scroll down and select your app though.

Thanks for your reply! I’m interpreting what you’ve said to mean “the user’s App Store account has been deleted.” None in particular seemed suspicious, I was just a little surprised at the incidence rate for this error code. Among our receipts is slightly more than 1/1000, which seems a little high to me. But frankly the major confusion was I had 21010 down as “unauthorized” rather than “account not found” and I thought the difference in error code was strange. Thanks @App Store Commerce Engineer

@eskimo Thanks for the detailed answer! I feel like I understand the tradeoffs now. I appreciate that Apple has internal style to stick to & whatnot, but in my personal opinion this bullet point would much enhance the technote: URLSession is very much focused on HTTP, and WebSocket isn’t an HTTP-like protocol. While it uses HTTP under the covers, the actual WebSocket protocol is a reliably bidirectional connection with message framing. Those semantics are a much better match for NWConnection than URLSession. That really cleared up for me why it was a generally good starting point, rather than "start with URLSession & use NWConnection when you need something special". One last bit if you don’t mind — is there official documentation/tutorial/walkthroughs/etc. that explain making a WebSocket connection with NWConnection? It looks a bit more complicated to setup than URLSession & is definitely less familiar to me.

@Jason This Technote is awesome. Is there any explanation of this recommendation? Unless you have a specific reason to use URLSession, use Network framework for new WebSocket code. That seems like the opposite of what I would expect, so I'm curious to understand why we should prefer Network framework over URLSession for websockets.

Note: I have also attempted this with Xcode 13.1 which yielded no difference.

There is now API for showing an Apple-managed UI on your UIWindowScene for managing subscriptions (https://developer.apple.com/documentation/storekit/appstore/3803198-showmanagesubscriptions) but I don't think you can display your own UI for cancelling or programmatically cancel without interaction.