Create Invitation Only System - PHP5

We are looking for a keen web developer who can create an 'invitation only' add-on for a popular script. Simply change the way that members can sign up for the system, they can only sign up if they have received a unique link from either members or the admin. Full project details will be given to the programmer (see attached) The programmer should be an expert in the following languages PHP 5, MySQL 5 and cURL. This is a small project and a full briefing will be provided to the successful applicant. We have a lot of projects to work on, if we like the work you do on this script then we will use you again. We have a 2 day deadline on this script and the pay is a generous fixed US $30 which will be paid via freelancer on completion of testing. To apply you must agree with the following:- * All work completed (including all code) must not be used by you again. The copyright of the code will be owned by us.