{
  "type": "recommendation",
  "candidate_category": "book",
  "user_id": "2f5ce191128aa2f36900ec186e09f8c0",
  "candidate_list": [
    "22444827",
    "6307047",
    "7058757",
    "15798427",
    "23673064",
    "1266231",
    "6372437",
    "733710",
    "414365",
    "114641",
    "568552",
    "24266541",
    "9734784",
    "7796750",
    "12919495",
    "6555436",
    "23510852",
    "9953057",
    "367007",
    "739182"
  ],
  "loc": [
    -1,
    -1
  ]
}