The cancel method by shipmentId Marks a shipment cancelled, if it is no longer needed or being used by your organization. Any label associated with the shipment needs to be voided first An example use case would be if a batch label creation job is going to run at a set time and only queries pending shipments. Marking a shipment as cancelled would remove it from this process https://shipengine.github.io/shipengine-openapi/#operation/cancel_shipments

The create method allows for creating shipments based on a list of shipment items passed into this method.

Retrieve a shipment using an external shipment Id

The getShipmentRates method retrieves rates for a given shipment by shipment ID.

The list method retrieves a list of shipments for a given user.