toJson method
Implementation
core.Map<core.String, core.dynamic> toJson() => {
if (lineItems != null) 'lineItems': lineItems!,
if (operationId != null) 'operationId': operationId!,
if (shipmentGroupId != null) 'shipmentGroupId': shipmentGroupId!,
if (shipmentInfos != null) 'shipmentInfos': shipmentInfos!,
};