https://github.com/mschneider/solcpp/blob/main/examples/accountSubscribe.cpp is a basic example for how to get the recent fills. We need a more complete example that is able to fetch the orderbook in addition and prints the following to the CLI on every SOL-PERP order book update:

1. Last traded price
2. Mid-price
3. Spread in basis points
4. $ +2% depth
5. $ -2% depth