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