Every time the "submit order" button is clicked, an authorization is attempted on your card. This will generally show under the "pending" transactions in your account. 

However, if the authorization fails for any reason (address, name, etc) the order will not be submitted. In these cases, the attempted authorization will still show on your account. This authorization is not a charge and will be removed from our account. 

Payment authorizations on successful orders are captured at the time of shipment or 3 days after your order was submitted, whichever is sooner.