Expanded class hierarchy of USPSShipment in Commerce USPS 8
- class \Drupal\commerce_usps\USPSShipmentBase implements USPSShipmentInterface
- class \Drupal\commerce_usps\USPSShipment implements USPSShipmentInterface
- class \Drupal\commerce_usps\USPSShipmentInternational implements USPSShipmentInterface