toJson method
Implementation
core.Map<core.String, core.dynamic> toJson() => {
if (kind != null) 'kind': kind!,
if (leaderboardId != null) 'leaderboardId': leaderboardId!,
if (score != null) 'score': score!,
if (scoreTag != null) 'scoreTag': scoreTag!,
if (signature != null) 'signature': signature!,
};