Do you think your bank provides a free and open API that can be used by such a tool? Unlikely.
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It's what open banking or midata is in the UK...
I quickly looked up midata and it seems like a government "standard" so banks can provide your account data as a uniform downloadable format.
But you are asking for "live integration" which is very different.
In the UK, Monzo provides an open REST API, which includes webhook support
Cool!
Firefly III supports bank accounts integration using PSD2 via Nordigen (aka GoCardless): https://docs.firefly-iii.org/data-importer/faq/spectre-and-nordigen/
Not a "live integration" tho, when i tried it some months ago.
What even is a “live integration”?
The premium APIs are just for automatic categoring at the source (i.e. you download your transactions with categories already). Firefly III does support automatic import using Nordigen by setting up a cron job which automatically POST the transactions downloaded using Nordigen API. You will have to setup the Nordigen connection only the first time you do it, then download the json and POST the correct url. There's a section in documentation of the data importer which explains exactly that.
Check Actual Budget. It's very simple to set up compared to Firefly iii.
Edit: it has GoCardless integration https://actualbudget.org/docs/advanced/bank-sync#link-accounts-with-gocardless