ColdFusion - PayPal IPN Payment & Invoice App

This should be a very simple project.? I want an Invoice System that allows me to create invoices for customers. I want the customer to have access to their current and past invoices via authentication / my account.? Customer will login and pay invoice with PayPal. PayPal IPN or best integration to KEEP customer on OUR site and not PayPal is desired. Database Required: Access or mysql - coders preference. ## Deliverables The best example I can provide is this:? <[login to view URL]> I purchased it, but never got it working to my liking.? Very simple application. DEMO ADMIN:? <[login to view URL]>? I like this very much CLIENT LOGIN:? <[login to view URL]> You will see what I am after.