Example oneboxes using iTunes URLs
[onebox url="https://itunes.apple.com/app/id570316450"]
[onebox url="https://itunes.apple.com/us/album/artpop/id687591810"]
[onebox url="https://itunes.apple.com/au/book/shantaram/id400433788?mt=11&uo"]
[onebox url="https://itunes.apple.com/gb/movie/the-dark-knight/id290567624"]
[onebox url="https://itunes.apple.com/ca/tv-season/brooklyn-nine-nine-season-1/id689475045?uo=4"]
[onebox url="https://itunes.apple.com/us/music-video/beautiful/id299373716?uo=4"]