ClickCart Pro Professional Variant data mapping to Ebay API

We require an application to extract products of our choice from our ClickCart Pro website which is a Full PHP application with a database in SQL and list these on ebay using eBays API. We require the ability to take stock levels from our ftp site, update the stock levels on the website and then to update the auctions on ebay with the correct levels of stock, this process is to run on a scheduled basis approximately every 30 mins. We require the ability to extract the sales from ebay API and post back to the website as orders so the website can handle all orders so that we can have one interface for all work. We will be looking at including amazon in the same system in the near future. We can provide whatever equiment is needed to run this if it is standalone from the website rather than hosted on the website. Under no circumstances will we accept any data or services that require hosting anywhere apart from our servers. Once written this application will be exclusive to us and cannot be sold on to other parties unless you have a prewritten application that can be delivered in a matter of hours. The expected time scale for thsi project is less than 2 weeks and we would like to get started straight away. We will require the develper to commincate with us using either email or skype as the project is running and will expect daily updates as to how the project is progressing.