Abstract: A method and apparatus for allowing a vendor to: create, maintain, validate, submit, review, and print all of its invoices, such as for example air, armored, ground, and automated teller machine (ATM) fault servicing, on a secure network is provided. GUI screens are provided for inputting invoices, making invoice preparation as simple and as efficient as possible. In one embodiment of the invention, a copy invoice function is provided for a vendor to select an invoice or any detail items from a list of previously entered invoices, pull the invoice into a current invoice work area, make appropriate changes for a given month, and then submit the month's invoice. An invoice validation mechanism and various reporting mechanisms, such as for example a management reporting mechanism and an accounts payable report mechanism are also provided.