member’s management script

I need a very simple member’s management script to protect the content of one folder of our website. Here’s what needs to be done: - People buy our product from [login to view URL] - They get redirected to our payment processor’s page - Once the transaction is approved they land on a page called [login to view URL] - From this page we need them to register by inputting their desired username + password - Once they have created their profile they can log in and have access to [login to view URL] - They get an email with their username + password - They should be able, when they sign on, to get by email their lost password. - It should be possible to delete profiles to disallow access to the members only directory. Please in your bid, explain briefly how you will get achieve what we require. Bid should be less than 100$ Good luck. Vincent