Visited yesterday and charged with credit card without any issue.
The chargers are in the outdoor Jumbo parking. There are no gates. No signs to the charging station. It's in the last row, at the exact coordinates where the Swisscharge marker is.
Parking is paid, 50ct for 30min around the hour. Maximum parking 90min all day and every day. I suppose you can easily skip paying if you stay with your car for the entire charging session. The parking meter is near the shop entrance.
Contactless is working on both units, 55ct/kWh, 45CHF reservation. 277670/277671 is the left unit. 277672/277673 is on the right. Only the left unit seems to have the Energie360° screensaver with the prices and QR codes. The right unit has the default Aplitronic screensaver.