code: def _register_bindings(self, data):
          
          self._register_diff_order_book_channels()
          self._register_live_orders_channels()
          self._register_live_trades_channels()
          self._register_order_book_channels()
docs: connection_handler method which is called when we connect to pusher.
          Responsible for binding callbacks to channels before we connect.
          :return: