ReturnShipment
Magento\Shipping\Model\Shipment\ReturnShipment
What it does
This class represents a return shipment request in Magento 2's shipping system.
Developers use it to store and transport shipment data when processing product returns, including shipper and recipient information, addresses, shipping methods, and package details.
It extends DataObject to provide magic getter/setter methods for all shipment-related properties without explicitly defining them.