public override object Call(params object[] args)
{
  if (args.Length < 2)
      return null;
  
  var command = args[0] as string;
  var player = args[0] as TSPlayer;

  switch (command)
  {
      case "GetRankData":
        return GetRankData(player);
      case "ResetRankData":
        return ResetRankData(player);
      default:
        return null;
  }
}

var rankPlugin = ServerApi.Plugins.FirstOrDefault(p => p.Plugin.Name == "RankPlugin");

if (rankPlugin == null)
{
    player.SendErrorMessage("Rank plugin not available!");
    return;
}

var rankData = rankPlugin?.Plugin.Call("GetRankData", player) as string;
player.SendSuccessMessage(rankData);