Are Paypal: how to get the posts the customers subscribed to?

Hello.

I intend to monetize some content with the help of the Are Paypal plugin that works fine for my needs. What fits well is the framework within witch, before beeing able to pay, the customer have to sign up to the blog. So that, he gets a permanent account.
Besides, I’d like to grant my customers with the list of the posts they purchased, for future reference if they need to access them again. Kind a “My Library”.

There is the point: I wrote yet the correct mySQL query that returns the right posts ID, but I definitely lack the skills required to create the PHP functions that I could call in my template. this function could populate the famous loop: <?php while ( have_posts() ) : the_post() ?>

I would greatly appreciate some help.
Thanks in advance and, best regards.
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François-Xavier Bodin – Bordeaux – France