Recommended UX
Design of the user experience is entirely up to you. Here, we merely offer a suggested payment UI flow for transitioning the user between redirects with the Token.io Web App.
There are, of course, a variety of options within the basic model. For instance, if the user chooses to specify their bank/account by BIC/IBAN while still in your app, the redirect can go directly to bank SCA (see the respective topic regarding creating a token request for PIS, AIS, and CAF). You can also customize the Token.io Web App with your logo and color scheme. Or, you can even create your own bank selection UI. It's entirely up to you. Token.io stands ready to assist with support for your particular business and technical policies.