If the payment type is credit card, then marking an order as "Paid" will also attempt to "capture" the amount from the associated credit card. Note: to reach this stage, the publisher has received authorization from the merchant bank to capture the amount from the credit card. Capturing payment can also be performed through the merchant website Authorize.net.
Find the order from the list that appears on the Order page (Menu Sales > Orders).
Notice the "Paid" link is active.
Click the "Paid" link. Now the link is no longer active and a message appears at the top of the page indicating that the order status has been updated.