For some classes or activities, the sports location asks for a small extra charge on top of your credits or subscription. This may apply to specific classes, for example. You'll see the amount in the app beforehand.
Important: you always pay an extra charge through the Workit app, not by card or cash at the location. You'll find the extra charge under Invoices in the app. If an extra charge remains unpaid, your account may be temporarily blocked, so make sure you pay it in time.