Initial draft

lib/dto/customer.dart

@@ -0,0 +1,15 @@
+import 'address.dart';
+import 'package:json_annotation/json_annotation.dart';
+
+part 'customer.g.dart';
+
+@JsonSerializable(fieldRename: FieldRename.snake)
+class CustomerDTO {
+  CustomerDTO({required this.name, required this.address});
+
+  String name;
+  AddressDTO address;
+
+  factory CustomerDTO.fromJson(Map<String, dynamic> json) => _$CustomerDTOFromJson(json);
+  Map<dynamic, dynamic> toJson() => _$CustomerDTOToJson(this);
+}