How to do the successful and unsuccessful pages with PayPal?

In general here is how you would setup a buy now button using PayPal that has the capability of sending the person back to your site. Read Step 5 carefully as this is what trips most students up.

1) Products and Services
2) Website Payments Standard
3) Select the type of Payment Button you want (Buy Now, Add to Cart, or Subscribe)
4) Click "Create Your Button Now"
5) Step 3 has options to define where you want your customers sent to. It is important you put in the fully qualified URL - for example if you are uploading to Aspen then your URL will be something like http://aspen.mnsu.edu/User/user_name/folder/file_name

Where user_name is your aspen user name folder is the folder you have saved your work file_name is the name of your HTML file.