{
  "description": "The details of a delivery contract. Includes the type of good, units needed, and the destination.",
  "type": "object",
  "properties": {
    "symbol": {
      "type": "string",
      "description": "The symbol of the trade good to deliver.",
      "minLength": 1
    },
    "destinationSymbol": {
      "type": "string",
      "description": "The destination where goods need to be delivered.",
      "minLength": 1
    },
    "unitsRequired": {
      "type": "integer",
      "description": "The number of units that need to be delivered on this contract."
    },
    "unitsFulfilled": {
      "type": "integer",
      "description": "The number of units fulfilled on this contract."
    }
  },
  "required": [
    "symbol",
    "destinationSymbol",
    "unitsRequired",
    "unitsFulfilled"
  ]
}