Looking for a subscription manager solution, my plan is --
Customer clicks “Subscribe” button and goes directly to a secure payment form at PayPal.
Customer pays via Paypal.
Customer clicks on return to website, where they may now download as many pdfs as they want.
Customer receives password via email, username is email address.
A user account is created automatically and the order tables updated appropriately with the IPN from PayPal, with name, email address, etc.
Free users may only download three pages a day, membership not required.
linux and windows, php 5.2, 5.3 and 5.4, mysql [url removed, login to view], and apache
10 freelancers are bidding on average $161 for this job
Understood your requirement clearly, can complete the job within the time-frame and to your complete satisfaction. Have done similar project before so no issues. Please check PMB for more details