@Override
  public String toString() {
    return String.format("Track{id=%s, title=\"%s\", isrc=%s}",
        id,
        title,
        isrc);
  }
POJO of track: https://developers.deezer.com/api/track
extensions/data-transfer/portability-data-transfer-deezer/src/main/java/org/datatransferproject/transfer/deezer/model/Track.java