<http://schema.org/thumbnailUrl>
<http://www.imore.com/sites/imore.com/files/styles/thumbnail/public/field/image/2014/07/itunes_pass_passbook_iphone_5s_hero.jpg?itok=LVAvGuto>
<http://www.imore.com/how-to-use-itunes-pass-with-passbook>