You can later charge the card one or several times from within the booking in Sirvoy.
The credit card details are handled and vaulted by the payment provider. This is often called tokenization, since a token that represents the card details will be created.
This means that no credit card details ever will touch your website, web server or computer. Neither will any card information be stored in Sirvoy. In other words, the card information will always be stored in a secure and PCI-compliant manner.
(With Stripe, you can a part from storing credit card details entered by the guest at the time of the booking also manually enter credit card details in an already existing booking, for later processing.)