Visited yesterday and charged with credit card, no issue.
There are 2 parking spots reserved for charging that are not part of the paid parking. Max 2h with blue disc. I'm including a picture of the parking tariffs to the right for reference, but they don't apply to the charger.
Like the other GWV DC chargers, contactless is built-in. It's 0.59CHF/kWh + 0.01CHF/min, then 0.25CHF/min after 2h. That's not the same price as the other GWV chargers, but I have not gone back to the other chargers to check if the price has changed globally.
You need to scan the card again to stop the charge.