curl --request POST \
  --url 'https://app.floral.so/api/v1/workspaces/acme-nordic/events/42/participants/0f8b6c1e-3a52-4d6e-9b7a-2c4e5f6a7b8c/attendance-correction' \
  --header 'Authorization: Bearer $FLORAL_TOKEN' \
  --header 'Idempotency-Key: correctEventParticipantAttendanceV1-20260816-001' \
  --header 'If-Match: "v1.eyJpZCI6IjBmOGI2YzFlLTNhNTItNGQ2ZS05YjdhLTJjNGU1ZjZhN2I4YyIsInJlc291cmNlIjoicGFydGljaXBhbnQiLCJ2ZXJzaW9uIjoiMyJ9"' \
  --header 'Content-Type: application/json' \
  --data '{
  "reason": "Checked in late at the side entrance.",
  "state": "ATTENDED"
}'

const options = {
  method: 'POST',
  headers: {
    'Idempotency-Key': '<idempotency-key>',
    'If-Match': '<if-match>',
    Authorization: 'Bearer <token>',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({reason: 'Checked in late at the side entrance.', state: 'ATTENDED'})
};

fetch('https://app.floral.so/api/v1/workspaces/{workspaceSlug}/events/{eventId}/participants/{participantId}/attendance-correction', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

{
  "correction": {
    "fromState": "NO_SHOW",
    "toState": "ATTENDED"
  },
  "participant": {
    "attendanceState": "ATTENDED",
    "company": {
      "id": 42,
      "name": "Acme Nordic"
    },
    "companyName": "Acme Nordic",
    "createdAt": "2026-09-02T10:20:00.000Z",
    "email": "ada@acme-nordic.example",
    "eventId": 42,
    "id": "0f8b6c1e-3a52-4d6e-9b7a-2c4e5f6a7b8c",
    "matchStatus": "MATCHED",
    "name": "Ada Jensen",
    "person": {
      "id": 84,
      "name": "Ada Jensen"
    },
    "phone": "+45 20 11 22 33",
    "registrationState": "REGISTERED",
    "representedCompany": {
      "establishmentNumber": null,
      "id": 42,
      "name": "Acme Nordic"
    },
    "responses": {
      "session_track": {
        "answeredAt": "2026-09-02T10:20:00.000Z",
        "value": "Workplace strategy"
      }
    },
    "source": "HOSTED",
    "updatedAt": "2026-09-25T09:00:00.000Z",
    "version": "v1.eyJpZCI6IjBmOGI2YzFlLTNhNTItNGQ2ZS05YjdhLTJjNGU1ZjZhN2I4YyIsInJlc291cmNlIjoicGFydGljaXBhbnQiLCJ2ZXJzaW9uIjoiMyJ9",
    "waitlistPosition": null
  }
}

{
  "error": {
    "code": "INVALID_INPUT",
    "message": "The request contains invalid values.",
    "requestId": "550e8400-e29b-41d4-a716-446655440000"
  }
}

{
  "error": {
    "code": "UNAUTHENTICATED",
    "message": "A valid bearer credential is required.",
    "requestId": "550e8400-e29b-41d4-a716-446655440000"
  }
}

{
  "error": {
    "code": "FORBIDDEN",
    "message": "The credential does not grant this operation.",
    "requestId": "550e8400-e29b-41d4-a716-446655440000"
  }
}

{
  "error": {
    "code": "NOT_FOUND",
    "message": "The resource was not found.",
    "requestId": "550e8400-e29b-41d4-a716-446655440000"
  }
}

{
  "error": {
    "code": "CONFLICT",
    "message": "The requested change conflicts with the current resource state.",
    "requestId": "550e8400-e29b-41d4-a716-446655440000"
  }
}

{
  "error": {
    "code": "VERSION_CONFLICT",
    "message": "The resource changed since it was read.",
    "requestId": "550e8400-e29b-41d4-a716-446655440000"
  }
}

{
  "error": {
    "code": "PRECONDITION_REQUIRED",
    "message": "If-Match is required for this operation.",
    "requestId": "550e8400-e29b-41d4-a716-446655440000"
  }
}

{
  "error": {
    "code": "RATE_LIMITED",
    "message": "Too many requests. Retry shortly.",
    "requestId": "550e8400-e29b-41d4-a716-446655440000"
  }
}

{
  "error": {
    "code": "INTERNAL_ERROR",
    "message": "An unexpected error occurred.",
    "requestId": "550e8400-e29b-41d4-a716-446655440000"
  }
}