[
  {
    "Id": 1,
    "ActivityId": 102000001,
    "RewardItem": {
      "50002": 10
    }
  },
  {
    "Id": 2,
    "ActivityId": 102000001,
    "RewardItem": {
      "50005": 10
    }
  },
  {
    "Id": 3,
    "ActivityId": 102000001,
    "RewardItem": {
      "50001": 10
    }
  }
]