First, you'll need to get your
token from the Nordigen's Open Banking Portal, and querry aspsp endpoint to get a list of all avialable ASPSPs (banks) in a given country.
You need to create a UI or any other selection mechanism for finding an end users bank. Commonly an end user is given a choice of supported banks by Nordigen in a given country to choose from.
Below is a style guide which is based on best practices.
Once an end user selects their bank account, the right
ASPSP ID needs to be passed in requisition for building a link for an end user to follow to.