I have successfully integrated Safari push notifications to my website and everything works fine for now. I foresee one problem though, which unfortunately is not covered in Apple Documentation at all: the push package is downloaded only once when a users accepts to receive pushes from my website.
But what if I ever decide to change the iconset, websiteName or the urlFormatString in the website.json file of the push package? Is there any way to force update the old push package my existing subscribers already have with a new one?