{
  "input": {
    "userId": "user-id",
    "type": "identify",
    "timestamp": "2014",
    "traits": {
      "firstName": "John",
      "lastName": "Doe",
      "null": null,
      "address": {
        "city": "SF"
      }
    }
  },
  "output": {
    "identify": {
      "_p": "user-id",
      "firstName": "John",
      "lastName": "Doe",
      "address": "{\"city\":\"SF\"}",
      "id": "user-id",
      "_k": "2b93bdf937c54fc7da2b5c6015c273bf3919c273",
      "_t": 1388534400,
      "_d": 1
    }
  }
}