When true (here or on any shipment group), every stop address of the order is matched against the assigned shipper's saved address book: a match overwrites the address fields with the saved values and fills in shipperAddressId, opening hours, properties and a matching contact, while an unmatched stop is stored as sent. Defaults to false and requires a shipper assignment somewhere in the order (any shipment group or, uniformly, its shipments); a stop already carrying a valid shipperAddressId is left as sent. Saved-address references are always validated: with matching enabled an unknown reference is rejected with status 400, otherwise it is removed and the order is still created; for an order with status requested the flag applies this validation only, and the stored shipment requests are not matched when the order is confirmed later (see the endpoint description).