I need you to complete a site that's currently around (60-70%)

I need some changes to an existing website. I need a programmer to complete a site that's made in php codeigniter/mysql/jquery/html5 so this arquitecture must remain, this site is similar to fiverr but much, much simpler, we already have done the Register, login, profile, searcher, product publish, etc. We need you to make the chat page (costumer, seller), the payment transactions (we are gonna integrate the payment system) you just need to program some logic related to the payment (notifications to the seller, updating balance, etc), and at most 1 or 2 more pages or finctionalities I'm forgetting right now. some modifications of the already made functionalities could be requested, the site is made in an old fashion way (almost no ajax) so some simple ajax with jquery could be requested also for the old pages (for the new ones that u are gonna make, Ajax is mandatory) the programmer must also have some basic design skills (nothing complicated) but most of the design (html) it's gonna be provided. *****IMPORTANT! ***** Please send me a private message to discuss the price, that way I'll be sure you red the description, and also know what I'm looking for.