When reviewing the credit card information that your client has submitted to you through the Credit Card Authorization Form, upon completion you will have the ability to then remove that information from your account through the Delete Now button.
Each Credit Card Authorization Form should be used per transaction for your client.
Once you have completed that transaction, you should then delete out credit card information from your account.
By clicking on the Delete Now button you will remove the following information from the Contact Profile; The name on the card, the card number, the CVV, the expiration date of the card.