const YahooFantasy = require('yahoo-fantasy');
const yf = new YahooFantasy(
  Y!APPLICATION_KEY,
  Y!APPLICATION_SECRET,
  tokenCallbackFn, // optional
  redirectUri // optional
);

yf.setUserToken(
  Y!OAuthAccessToken
);

// promise based
try {
  const meta = await yf.player.meta(
    player_key,
    league_key
  );
} catch (e) {
  // handle error
}

// callback based
yf.player.meta(
  player_key, 
  league_key,
  callbackFn
);

{
  "player_key": "328.p.6619",
  "player_id": "6619",
  "name": {
    "full": "Albert Pujols",
    "first": "Albert",
    "last": "Pujols",
    "ascii_first": "Albert",
    "ascii_last": "Pujols"
  },
  "editorial_player_key": "mlb.p.6619",
  "editorial_team_key": "mlb.t.3",
  "editorial_team_full_name": "Los Angeles Angels",
  "editorial_team_abbr": "LAA",
  "uniform_number": "5",
  "display_position": "1B",
  "headshot": "http://l.yimg.com/iu/api/res/1.2/iium.CfIaaN.XDy7fB4Reg--/YXBwaWQ9eXZpZGVvO…g--/http://l.yimg.com/j/assets/i/us/sp/v/mlb/players_l/20130405/6619.1.jpg",
  "is_undroppable": "0",
  "position_type": "B",
  "eligible_positions": [
    "1B",
    "Util"
  ],
  "status": {
    "ownership_type": "team",
    "owner_team_key": "328.l.34014.t.7",
    "owner_team_name": "TNTNT"
  },
  "league": {
    "league_key": "328.l.34014",
    "league_id": "34014",
    "name": "Freddy Beach Baseball",
    "url": "http://baseball.fantasysports.yahoo.com/b1/34014",
    "draft_status": "postdraft",
    "num_teams": 12,
    "edit_key": "2014-11-14",
    "weekly_deadline": "intraday",
    "league_update_timestamp": "1411979069",
    "scoring_type": "head",
    "league_type": "private",
    "renew": "308_51222",
    "renewed": "",
    "short_invitation_url": "https://yho.com/mlb?l=34014&k=0a2bf56970bb200c",
    "is_pro_league": "0",
    "current_week": "25",
    "start_week": "1",
    "start_date": "2014-03-22",
    "end_week": "25",
    "end_date": "2014-09-28",
    "is_finished": 1
  }
}