post https://example.com/api/v1/managed/orders/buy/market
Places a market order buy for a stock. This is the most common type of buy order, executing as soon as possible
(within US market hours). Minimum order value is $1, excluding fees. Stock prices may be subject to change upon
execution of the order.
More details on market orders here
Use the confirmation_code returned by this endpoint in the /order_requests endpoint to grab the order_id when available.