Yes at the pay page there's a 'pay by X' list of options, you choose it.

You then typically have two choices: scan QR with your phone or login to your bank.

I normally open my bank app on my phone which signs in via my face (iPhone), I then press the scan button (first screen), point at my phone at the screen to read the QR code, the transaction pops up on my phone, I press confirm and again it signs via my face. Then you're done.

If you were shopping on the phone it's even simpler of course as the pay button opens up the transaction in your bank app right away, but typically I shop on my laptop after research.

I've had this for almost 20 years by the way in the Netherlands, but now it's pivoted to the EU standard.