Abstract: An invoice processing system (200) includes a web browser equipped computer system (210) operated by a vendor that is Internet networkly coupled to an invoice processing server (202) providing a web page server. The vendor can enter invoice information (216) at the invoice processing server (202) to create an invoice at the invoice processing server. The invoice processing server (202) validates the invoice information (216) and determines the invoice is authorized for processing payment. The invoice processing server (202) provides a payment authorization signal to an accounting computer system (206) to initiate processing payment of the invoice in response to determining the invoice is authorized for payment.