Program asks from WebService function (with parameter 0) a collection, which describes (size, color, icon, isEnabled, and id) the buttons to be shown on screen. Selected button's Id is sent back to server using the WebServive function, which returns a collection for next buttons to shown on the screen.
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I can develop both the android and IOS. Is the webservice already developed ? I'm a 7 year experience Mobile developer developing Android/IOS apps with their backend services.