Live Website Analytics Application

I have designed an app for checking live visits to a website / websites The user add's their site in the app and pastes a snippet of code into the header of their site. Whenever the site gets a visitor they will recieve a push notification which takes them into the app and allows them to see which page is being visited and which city the person is accessing the site. A screenshot is attached. You will need to develop the snippet of code that the app generates for the user to implement into their site ( the more simple this is the better) The app needs to be able to read live data.