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Once the challenge attempt completed, the user retrieve their result by calling the getChallengeResult query. The query returns a ChallengeAttempt object in the response: 
query getChallengeResult {
  getChallengeResult(challengeId: 1) {
    score
    completedOn
    rank
    timeSpent
    higherThanScorePercentage
  }
}

​
Ranking calculation

If the ranking displaying disabled in the challenge, it will not be returned in API responses. Ranking is calculated based on the earned score which depends on the number of correct answers, and (if bonus points enabled for the challenge) on the time that is spent on each answer. If N users have the same score they will have the same ranking (R), the next user with a lower score will have rank (R+N).

Authentication

Understand the authentication requirements and how to properly authenticate your requests.