There is only one official in Badminton.
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Essentially, there are one, or none, officials that are on-site during all times at official tournament games. The official's responsibilities would be the score keeper, judge, and making sure that the game is honest and there is no foul play.
For some games and tournaments though, there ARE NO officials. For ever type of competition, the players are actually required to learn the score of their game, rather than let someone else remember it. The players also call their own lines and call the fouls that their opponent might commit.