lib/foursquare2/checkins.rb
def checkin(checkin_id, options={})
      response = connection.get do |req|
        req.url "checkins/#{checkin_id}", options
      end
      return_error_or_body(response, response.body.response.checkin)
    end
def checkin(checkin_id, options={})
      response = connection.get do |req|
        req.url "checkins/#{checkin_id}", options
      end
      return_error_or_body(response, response.body.response.checkin)
    end
Retrive information about a single checkin.

 @param [String] checkin_id the ID of the checkin.
 @param [Hash] options
 @option options String :signature - Signature allowing users to bypass the friends-only access check on checkins