Hi,
Your question is not much clear. As per my undestanding, you may use the concept of ERS for automatic invoice verification, where you can run ERS settlement transaction inorder to create and settle the invoice. Please go through the documents geven below.
http://scn.sap.com/docs/DOC-29105
http://scn.sap.com/docs/DOC-27952
Hope its Helpful.
regards,
AKPT