Auto invoice and auto change order status to complete after successful instant payment

Hi, We want to go online with our online shop where we want to sell downloadable and virtual products but we have some troubles with getting automatic change of order status to complete after successful instant payment. Therefore I am looking for an extention/module etc. for magento 1.6.2 online shop, which is able to do the following: 1. automatically change the order status to complete after successful instant payment 1.1. any instant payment methods like paypal, sofortueberweisung, mpay24, etc. 1.2. this auto change should be able only for downloadable and virtual products (for normal products there is no need) 2. automatically make an invoice and send it to the customer after successful instant payment 2.2. only for downloadable and virtual products (no need for normal products) Thanks in advance.