Integrate Austpay into website

we have an asp website, it only sells 10 items so we hard coded the products rather than built a shopping cart. This was taking payment through Paypal. the customer has now changed to Austpay. So we need to be able to take payments through Austpay. so we need a form to send the details to them. Then a Sucess page to email use and the client. Then an unsucess page. Each product only has 1 variable which is quantity.