We have an ebook which we want to sell using Paypal and Google Check out Buttons.
We need to have the user click on either button and pay using their networks. Upon successful transaction we need to direct the user to a download page where they can download the ebook. This needs to be an encrypted download page for security purposes and limit the download link to stay active for 24 hours.
We also need to have the email be sent to the customer with the download link as well.
Let me know if you have any questions.
I use google checkout and paypal on many of my sites and have more than enough experience to quickly create the payment and secure download system you desire.