A credit card is charged and authorized in Altru as soon as the card is swiped in the Daily Sales screen. We know this because when the Credit Card line item populates the cart, we see a 6 digit authorization associated with the credit card. If the sale is canceled instead of completed a refund will be issued to the credit card, and no record of the sale will be in Altru. You will only see the initial charge and refund in your Merchant Service Account (Cybersouce or BBMS). The refund will be slower to process than the initial charge, but should show on the constituent's bank statement in approximately 24-48 hours. 
Image of Credit Card in Daily Sales
Note: If the refund does not show up on the constituent's card, please Chat with Support