Thanks, but as mentioned there are many undocumented possible values for Shop’s plan:
frozen> cancelled> dormant> fraudulent
And the shop/update webhook does not tell us if the merchant will be billed for your app in the future or not.
Unless you can specify how to do it better?
This is exactly what the post is about - there’s no documentation about how to handle subscription cancellations other than manual cancellations or uninstall of the app.