As long as your contract is active, in addition to the one-off sign-up fee charged at the beginning of the contract, the package price of your car subscription will be charged every 30 days at the beginning of a billing period using the payment method you have provided. If you book additional services (e.g. child seat) that are not included in the fixed rental price when you order online or collect the vehicle from the SIXT station, these additional services will be billed every 30 days with the next monthly invoice. If an additional service is only booked when the vehicle is picked up at the station, the respective fee is authorized on the corresponding means of payment until the settlement for the next term .