toJson method
Implementation
Map toJson() {
final val = <String, dynamic>{};
val['country'] = country;
if (line1 != null) val['line1'] = line1;
if (line2 != null) val['line2'] = line2;
if (area1 != null) val['area1'] = area1;
val['area2'] = area2;
if (postalCode != null) val['postalCode'] = postalCode;
return val;
}