{
  "uploads": [
    {
      "id": "e7d35b19-04c2-4a8f-93e6-b1f2c8a4d057",
      "filename": "STU-10A-0142-science.pdf",
      "upload_url": "https://uploads.example-storage.com/eval/...signed...",
      "method": "PUT",
      "headers": {
        "Content-Type": "application/pdf"
      },
      "expires_at": "2026-10-14T06:58:41Z",
      "status": "pending"
    }
  ]
}

{
  "error": {
    "code": "invalid_api_key",
    "message": "The API key is not valid.",
    "request_id": "req_4f9c2a7e1b3d4c8a9e6f0b2d5a7c1e3f"
  }
}

{
  "error": {
    "code": "insufficient_scope",
    "message": "This API key lacks the evaluation:write scope.",
    "request_id": "req_4f9c2a7e1b3d4c8a9e6f0b2d5a7c1e3f",
    "details": {
      "required_scope": "evaluation:write"
    }
  }
}

{
  "error": {
    "code": "validation_failed",
    "message": "questions[0].max_marks is required.",
    "request_id": "req_4f9c2a7e1b3d4c8a9e6f0b2d5a7c1e3f",
    "details": {
      "errors": [
        {
          "field": "questions[0].max_marks",
          "code": "required",
          "message": "max_marks is required."
        }
      ]
    }
  }
}

{
  "error": {
    "code": "rate_limited",
    "message": "Too many requests. Retry after 2 s.",
    "request_id": "req_4f9c2a7e1b3d4c8a9e6f0b2d5a7c1e3f"
  }
}