Hell I have the app on my phone, but yesterday, I received a ticket for an event, accepted it, and downloaded it to my phone without using that app at all.
I think OP is misunderstanding what is happening. The code changes every so often, probably to prevent people from passing around a screen shot and trying to get in that way. You can get the ticket without the app.
When I have a concert I usually install the app, load the ticket into my mobile wallet, and delete the app
Hell I have the app on my phone, but yesterday, I received a ticket for an event, accepted it, and downloaded it to my phone without using that app at all.
I think OP is misunderstanding what is happening. The code changes every so often, probably to prevent people from passing around a screen shot and trying to get in that way. You can get the ticket without the app.