When exactly the card is charged

In two stages. First the card company approves a hold for the amount — reserved on the card, but not yet taken. Then, if the space is kept for you, the amount is taken, and the booking closes only when the payment is captured.

If the booking does not close — for instance if the space was taken in the meantime — nothing is charged. The hold is released by the card issuer on its own.

If someone else completed payment for the space before you, the booking does not close and you are not charged. A temporary hold for the amount may appear on your card — it is not a charge, and the card company releases it within a few days. If you leave the payment without finishing it, nothing is taken and the space stays open to everyone.

Only a payment that has gone through releases the full address and the other side's contact details. Until then the address is not disclosed.