A sample push API consumer for the new foursquare push API. Has a very simple endpoint for doing OAuth, and a /checkin handler that receives a POST with checkin and user JSON. The JSON is expected to have a "checkin" key with a corresponding checkin object, and a "user" key with a correspoding compact user object. Those formats are described in more depth at http://developer.foursquare.com/docs/responses/checkin.html and http://developer.foursquare.com/docs/responses/user.html, respectively.