I don’t know if I have a good answer. It’s not something I’ve had to deal with myself. Hopefully others can share what they have done.
- You could create a copy, make your changes in the copied version to test them, then duplicate those same changes in the production version.
- You could create a copy, make your changes, then transfer the subscription to the new copy and flip the urls between the two apps. (There could be a short period of time where the users are affected while you are doing this though.)
I guess it’s whatever you are most comfortable with.