You can top up the ticket on any keycard - even from other ski resorts. Enter the 23-digit number (01-xxxx xxxx xxxx xxxx xxxx-x) found on the keycard.
You may keep this card in your user account and will not need to enter it again the next time.
No. Your order (= booking) is stored on the servers of the access system provider (SKIDATA). When you first pass through the turnstile in the ski area, your keycard (= ski card) is read and the server queried whether an authorization exists. If so, the turnstile opens.