code: def _register_diff_order_book_channels(self):
          
          channels = {'diff_order_book': self.btcusd_dob_callback,
                      'diff_order_book_btceur': self.btceur_dob_callback,
                      'diff_order_book_eurusd': self.eurusd_dob_callback,
                      'diff_order_book_xrpusd': self.xrpusd_dob_callback,
                      'diff_order_book_xrpeur': self.xrpeur_dob_callback,
                      'diff_order_book_xrpbtc': self.xrpbtc_dob_callback}
  
          event = 'data'
          self._bind_channels(event, channels)
docs: Registers the binding for the diff_order_book channels.
          :return: