{
  "name": "Order",
  "description": "TD Ameritrade brokerage trade order",
  "fields": [
    {"name": "orderId", "type": "integer", "description": "Unique order identifier", "required": false},
    {
      "name": "orderType",
      "type": "string",
      "description": "Order type",
      "required": true,
      "enum": ["MARKET", "LIMIT", "STOP", "STOP_LIMIT", "TRAILING_STOP"]
    },
    {
      "name": "session",
      "type": "string",
      "description": "Trading session",
      "required": true,
      "enum": ["NORMAL", "AM", "PM", "SEAMLESS"]
    },
    {"name": "price", "type": "number", "description": "Limit price (for LIMIT orders)", "required": false},
    {
      "name": "duration",
      "type": "string",
      "description": "Order duration",
      "required": true,
      "enum": ["DAY", "GOOD_TILL_CANCEL", "FILL_OR_KILL"]
    },
    {
      "name": "status",
      "type": "string",
      "description": "Order status",
      "required": false,
      "enum": ["QUEUED", "WORKING", "FILLED", "CANCELED", "REJECTED", "EXPIRED"]
    },
    {"name": "accountId", "type": "string", "description": "Account identifier", "required": false},
    {"name": "enteredTime", "type": "string", "description": "Order entry timestamp", "required": false},
    {
      "name": "orderLegCollection",
      "type": "array",
      "description": "Order legs",
      "required": true,
      "items": {
        "name": "OrderLeg",
        "type": "object",
        "fields": [
          {"name": "instruction", "type": "string", "description": "Buy/sell instruction"},
          {"name": "quantity", "type": "number", "description": "Number of shares/contracts"},
          {
            "name": "instrument",
            "type": "object",
            "description": "Security being traded",
            "fields": [
              {"name": "symbol", "type": "string", "description": "Ticker symbol"},
              {"name": "assetType", "type": "string", "description": "Asset type (EQUITY, OPTION, etc.)"}
            ]
          }
        ]
      }
    }
  ]
}