Develop a link management system

We are looking for a links management systems that we can use across 12 information websites [login to view URL] [login to view URL] [login to view URL] [login to view URL] [login to view URL] [login to view URL] [login to view URL] [login to view URL] [login to view URL] [login to view URL] [login to view URL] [login to view URL] [login to view URL] [login to view URL] In this system companies will need to be able to go to 1 central page to add reciprocal or paid links on our sites, Required functionalities 1 central website page companies can use to add/remove / change links A link preview system A link approval administration page Link tracking Validation of reciprocal links Traffic per link A very simple paypal billing system Technical requirements This system can be prepared using off the share software or programmed in PHP. All source code delivered needs to be delivered with reasonably clear coding if we need to make a modification at a later date and you/your company is not available to do the work Your quote Please provide a quote for a full working system installed on our server More details are available in the attachment. kind regards, webjuicer