You recently added a blur effect when going into the app switcher in iOS. This seems sensible to obfuscate your balance while switching apps, but it can be quite laggy even on the latest iPhone which I have, and it seems a pointless step IF you have the today widget enabled.
So may I suggest that if the widget is enabled (and therefore your balance is visible to anyone who picks up your phone even when locked) you don’t bother doing the blur effect?
Your transactions would then be visible however. Someone might not be bothered about someone seeing how much is on their card but they might well want to keep a transaction secret for various reasons.
True, perhaps some sort of general secrecy option would be best. If enabled it blurs in app switcher, requires Touch ID to enter the app, won’t show balance in the widget…