Invoices for your customers' payments are available on their CDR Control Panel.  A report showing all payments and credits recorded on an account is available by clicking on the Payment history link in the Main menu box.  If an entry relates to a customer payment, then a link is provided to view a printable invoice for the payment.  The invoice can be customised by adding a header and footer to each page.  Please contact support@dualsoftswitch.com for more information.