{
  "type": "recommendation",
  "candidate_category": "book",
  "user_id": "4fdfdc4addcb7285410078eece2d81dd",
  "candidate_list": [
    "22549842",
    "13194973",
    "12923664",
    "6746975",
    "25521402",
    "22820016",
    "30279190",
    "6381477",
    "1477666",
    "11231289",
    "10326007",
    "9314660",
    "1077932",
    "2090918",
    "3774781",
    "6443496",
    "8075485",
    "7630451",
    "8195824",
    "6010935"
  ],
  "loc": [
    -1,
    -1
  ]
}