curl --request GET \
  --url https://{defaultHost}/v1/auth/{app_id}/challenges/{token}

{
  "challenge": {
    "token": "ch_abc123xyz789",
    "status": "pending",
    "purpose": "authenticate",
    "method": "email_otp",
    "expires_at": "2023-11-07T05:31:56Z",
    "remaining_attempts": 3,
    "time_remaining": 540,
    "intent": "<string>",
    "delivery_required": true
  }
}