toJson method
Implementation
core.Map<core.String, core.dynamic> toJson() => {
if (country != null) 'country': country!,
if (locationId != null) 'locationId': locationId!,
if (postalCode != null) 'postalCode': postalCode!,
if (rate != null) 'rate': rate!,
if (region != null) 'region': region!,
if (taxShip != null) 'taxShip': taxShip!,
};