How do you casually link your bank account to some app? Is it common for banks to have safe readonly APIs or so in your country?
Then you can use an API aggregator service such as SaltEdge, TrueLayer, Teller [1], etc. (I'm not associated with any of these). Or you can try to roll your own.
[0] - https://www.openbanking.org.uk/about-us/ [1] - https://www.truelayer.com https://www.saltedge.com https://www.teller.io