Bearer authentication header of the form Bearer <token>, where <token> is your auth token.
The leaderboard to get
apps, app_playtime, app_valid_playtime, awards_given, awards_received, bans, game_bans, vac_bans, donations, foil_badges, normal_badges, badges, playtime, valid_playtime, points_given, points_received, steam_sets, xp, badge_completion_time, badge_highest_level For a given app leaderboard, the app id
For a given badge leaderboard, the steam badge id
The location(s)to get the leaderboard for, otherwise global