post https://example.com/api/v1/managed/orders/buy/limit
Places a limit order buy for a stock. Targets a specific price to execute the order, but fulfillment is not
guaranteed. Only available for whole number stock quantities. Note that fees are not included in the limit
price and will be added to the total payment for the order.
More details on limit orders here
Use the confirmation_code returned by this endpoint in the /order_requests endpoint to grab the order_id when available.