My app crashes when a button is pressed, however only on a small percentage of devices. I can't reproduce it on my end, but I have a crash log from a TestFlight user. Any thoughts on what this crash log could be indicating? crashlog.crash

I've been researching how to implement a subscription into my app, but much of the information I've found online uses SwiftUI. My app is developed with Swift/UIKit, and I've had trouble finding a good resource that's applicable. Does anyone have resources for implementing in-app subscriptions?