docs: public void marshall(UserMetadata userMetadata, ProtocolMarshaller protocolMarshaller) {
  
          if (userMetadata == null) {
              throw new SdkClientException("Invalid argument passed to marshall(...)");
          }
  
          try {
              protocolMarshaller.marshall(userMetadata.getId(), ID_BINDING);
              protocolMarshaller.marshall(userMetadata.getUsername(), USERNAME_BINDING);
              protocolMarshaller.marshall(userMetadata.getGivenName(), GIVENNAME_BINDING);
              protocolMarshaller.marshall(userMetadata.getSurname(), SURNAME_BINDING);
              protocolMarshaller.marshall(userMetadata.getEmailAddress(), EMAILADDRESS_BINDING);
          } catch (Exception e) {
              throw new SdkClientException("Unable to marshall request to JSON: " + e.getMessage(), e);
          }
      }