There are several companies who have build PSD2 api's and have contracts with all banks. For example in the Netherlands: https://bizcuit.nl/wat-is-psd2/
You could also register with a bank itself to connect to their PSD2 API. However I don't know the costs to obtain a license.
https://www.dnb.nl/en/innovations-in-payments-and-banking/fi...
There are several companies who have build PSD2 api's and have contracts with all banks. For example in the Netherlands: https://bizcuit.nl/wat-is-psd2/
You could also register with a bank itself to connect to their PSD2 API. However I don't know the costs to obtain a license.