Implementing Serialization/Deserialization

ObjectMapper mapper = JsonMapper.builder()
    .addModule(new JavaTimeModule())
    .disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS)
    .disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES)
    .serializationInclusion(JsonInclude.Include.NON_NULL)
    .build();
String json = mapper.writeValueAsString(order);
Order o = mapper.readValue(json, Order.class);

public class MoneySerializer extends JsonSerializer<Money> {
    public void serialize(Money v, JsonGenerator g, SerializerProvider sp) throws IOException {
        g.writeStartObject();
        g.writeStringField("currency", v.currency().getCurrencyCode());
        g.writeNumberField("amount", v.amount());
        g.writeEndObject();
    }
}

@JsonTypeInfo(use = JsonTypeInfo.Id.NAME, property = "type")
@JsonSubTypes({
  @JsonSubTypes.Type(value = Card.class,    name = "card"),
  @JsonSubTypes.Type(value = BankXfer.class, name = "bank")
})
public sealed interface PaymentMethod permits Card, BankXfer {}