Create an URL submission script

Hi, I need a PHP script that is database (MySQL) driven and has the following components/features: - A user control panel. - The option for a user to register a username and password for the website, after which he can login with the registered username and password to the user control panel. - The user control panel needs to have the ability to submit/remove a string (in this case, a URL) from a database. Users will also have different limits on their account - for example, User A has 10 points, which allow him to submit 10 URL's, User B may have 20 points, which allow him to submit 20 URL's, etc. We'll also need to be able to manually edit the limits for each user. - The last feature is the ability to automatically add/remove limits to a user account. Example, if a user pays $39, the script needs to add 50 additional points to that user. For this feature, we'll be using instant notifications (or IPN) for a payment provider. Thanks! If interested, I'll send more detailed information and a sample via PM.