This event should be fired anytime the user clicks a button to load more Pixlee content for "filmstrip or horizontal" style widgets

  "uid": "d284fb3c-5c29-e316-ed71-8ce7852f8e50", //required, any unique string that tracks the user currently browsing
  "parentURL": "", //optional but recommended, the URL on which the user loaded the widget
  "API_KEY": "abcdefg", //required, the Pixlee ACCOUNT PRIVATE API KEY
  "album_id": 12345 //required, the Pixlee album id from which you are displaying content
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