curl --request GET \
  --url https://{subdomain}.nudj.cx/api/v2/analytics/challenges/stats/users \
  --header 'x-api-token: <api-key>'

{
  "data": {
    "data": [
      {
        "userId": "<string>",
        "username": "<string>",
        "email": "<string>",
        "startedAt": "<string>",
        "actionsCompleted": 123,
        "totalActions": 123,
        "completionRate": 123,
        "lastActivityAt": "<string>",
        "completedAt": "<string>",
        "completionTimeHours": 123
      }
    ],
    "pagination": {
      "total": 123,
      "skip": 123,
      "limit": 123
    }
  },
  "summary": {
    "totalParticipants": 123,
    "totalCompletions": 123,
    "averageCompletionRate": 123,
    "isEstimated": {
      "averageCompletionRate": true
    }
  }
}