When you place your pre-order, we ask for your credit card details. As with all payments to Packt Publishing, these details are entered into the secure servers of our payment provider Worldpay. They are not at any time held on our local servers. Worldpay record this transaction, but do not complete it. Nor do they reserve any pre-authorized funds on your account. They set up what they call a limited FuturePay agreement which is your agreement for us to process a one off payment for the agreed amount at the future date when the book ships. When the book you have pre-ordered is available for shipment, we notify them, and they process your credit card for the agreed amount. For eBook pre-orders, link to download the eBook will be available when the book is published and the payment is received.We then send you a receipt as for a regular order. You will also receive an email directly from Worldpay.