If you choose credit card as your payment option, then the payable amount will initially only be reserved on your card.
The amount will only be deducted, when the shipment is dispatched.
In case of part deliveries, only the amount corresponding to the actual shipment value will be deducted.
Please note that some countries offer so-called debit cards for online shopping in addition to regular credit cards. The amount will be debited via your card provider immediately, where a debit card is used for payment.