It’d be really great to be able to see why a transaction was declined. For example -
Declined - card is locked (yep, I’ve forgotten to unlock quite a few times)
Declined - decline by curve card cancelled (had my curve card reissued before but didn’t realised)
Declined - decline by curve, merchant disallowed
Declined - decline by bankX
Ideally it’d also be good if the declines could be visible in the app somewhere after dismissing the notification. This would be helpful when I need to call a company to make a payment (as happened with an offline payment after the card was cancelled) or if I need to raise a support request about a declined transaction.