When You Place Your Order:
When you place the order online, the credit card is pre-authorized. It isn't actually charged, it just confirms with your financial institution that the funds are available. Most credit card companies show this as a "PENDING" transaction if you look at your online account. This money is held to ensure your project is printed. Once your entire order ships, we'll capture the order total and the "PENDING" amount will drop off within 1-3 business days, depending on your financial institution's policies.
When You Modify Your Order: (different dollar amount)
Once your order ships, only what ships is what will actually be charged to your credit card, releasing the "PENDING" transaction. So, if you have a $300 order and cancel $100 worth of items, when your order ships we will release the "PENDING" $300 and charge your card just $200.