Ios App Tracking SDK

Hello, We are looking for someone to develop an ios sdk which will allow us to register app installs. The purpose of this sdk is to be added to various apps allowing our server to match installs to the clicks that generated them. What we need is an ios cookie based SDK for app tracking similar to the one available by Ad-x. Before app download a cookie with a given key-value will be stored on the user's browser. We need the app to open the browser (only in the first time the app is run) to a given url so the match can occur. Afterwards the browser should close and return to the app. The callback url will be provided shortly. If you intend to apply for this project, please describe shortly what would be your approach and if you have any experience in app download tracking. Thank you. M. Barone