Ionity isn't contactless. You need to use the website, App or RFID card. Chargepoint's card is the cheapest way to access it, but you can also use the likes of Octopus or Shell Cards too.
For a minute I was trying to work out what Onto had to do with it, and why they'd be desperate, then I re-read and realised you're not talking about the subscription company (where we get Shell cards that work with Ionity).Onto the ‘only if desperate’ pile then