{
  "type": "object",
  "properties": {
    "symbol": {
      "type": "string",
      "description": "The symbol of the trade good."
    },
    "type": {
      "type": "string",
      "description": "The type of transaction.",
      "enum": [
        "PURCHASE",
        "SELL"
      ]
    },
    "units": {
      "type": "integer",
      "description": "The number of units of the transaction.",
      "minimum": 1
    },
    "pricePerUnit": {
      "type": "integer",
      "description": "The price per unit of the transaction.",
      "minimum": 1
    },
    "shipSymbol": {
      "type": "string",
      "description": "The symbol of the ship that made the transaction."
    },
    "timestamp": {
      "type": "string",
      "format": "date-time",
      "description": "The timestamp of the transaction."
    }
  }
}