Pay on Receipt Auto Invoice

Hi All, can we payed the invoice based on the Receiving ???

i have find an article when i was trying to search the un order receipt and its matching provision and that article also gives me a broad vision to pay based on the Receipt ???

here the link is attach
http://www.aboutoracleapps.com/2007/08/pay-on-receipt.html

kind hava a look and reply me accordingly

thanx in Advance