code: def get_item(opts = {})
        args = get_item_args(opts)
        resp = ews.get_item(args)
        get_item_parser(resp)
      end
docs: Get a specific item by its ID.
   @param [Hash] opts Misc options to control request
   @option opts [String] :base_shape IdOnly/Default/AllProperties
   @raise [EwsError] raised when the backend SOAP method returns an error.