post https://t{tenantId}-s{siteId}.{env}.mozu.com/api/commerce/orders//shipments/repricecanceledshipment
FFMT svc will call this during full shipment cancelation or last item cancelation.
FFMT svs is performing shipment Rate validation.(FFMT svc is responsible for sending valid FlatratePerOrder shipments.)
Shipping costs of the canceled shipment will distribute to the active shipment.
Reset Shipping Costs of the canceled shipment to zero.