 An invoice that takes 20 days to be approved, for example, cannot be paid in time to qualify for a discount available from a supplier for payment on day 10.With the advent of electronic invoicing and Purchase-to-Pay (P2P) automation enabled by the Internet, buying organizations are increasingly able to approve invoices faster and take advantage of available discounts.Dynamic discounting methods were first invented and patented by Xign Corporation in the early 2000s to help businesses take advantage of these trends and establish early payment terms with suppliers.