code: def addtrack(self, shipment_increment_id, carrier, title, track_number):
          
          return self.call(
              'sales_order_shipment.addTrack',
              [shipment_increment_id, carrier, title, track_number]
          )
docs: Add new tracking number
  
          :param shipment_increment_id: Shipment ID
          :param carrier: Carrier Code
          :param title: Tracking title
          :param track_number: Tracking Number