When You Are Charged
All sales transactions take place once the minimum number of orders required to print the campaign have been met. This number is generated by a wide variety of factors, so it will differ between campaigns. Generally, though, the minimum tends to be between 5-10 orders.
This will always be one-time charge, no matter the circumstance.
On a campaign like this one, the goal hasn't been reached yet. However, the minimum requirement of five (5) has been met, so transactions will process.