"Open banking" is kind of a thing with PSD2/PSD3, but in name only. In reality, it's impossible to build anything useful. Interacting with any of the "open" APIs requires approval from a national bank (or similar institution), which means there are many hoops to jump through.
There is only one bank I know of that offers an API for end users ("bunq" IIRC). Every other god damned bank insists on being user hostile.