Added user registration, login, and authentication - endpoints.
Implemented account management API to retrieve user account information from 3rd Party providers.
Introduced order management features (place order, view orders, cancel orders).
Added market data endpoints to retrieve real-time quotes and historical data.
Integrated portfolio management API to retrieve open positions.
Implemented watchlist functionality (add symbol, get watchlist).
WebSocket support for real-time trades.
Error handling for all common API request failures (400, 401, 404).