How do I create dynamically generated user pages with downloadable content?

Goal – Create a page where a registered user insert their user ID and can see files that are available for them to purchase, digital download

Steps taken

1. Created PayPal digital downloads API to use with paypal digital goods download plugin
2. Created password protected page that currently holds 1 digital download at a time, this is not productive for multiple users.

My desire is for users to register and then go to “a page” enter their user ID and a single page will be displayed with their available files for purchase. The page should have a different password from the users login for security. The main page – where a user would enter their ID and Password – should be navigable but the user generated pages should not be navigable or displayed on the navigation menu.

Finally, as the admin I would need to be able to assign files to be downloaded using the customers ID. Ideally this would all be dynamic and I would not have to create individual pages for each and every user.

Further, this should mesh with my theme which is invert lite.

Any help would be appreciated!