Content or Node access as a product payment

Hi,

I would like to sell an online course (text, images, videos).

To do this, I would like to automate the purchasing / Accessing process.
I mean you should be able to choose on of the courses, pay through checkout and Paypal, receive tour login and password to access the specific course page, and this should be set for a specific time duration, 30 days for example.

I have investigated Drupal list of module, and in particular Über Cart, but I couldn't not find anything that would integrate product payment to content access.

Any has tried something like that?

Thanks for your help.