I need a Google Apps Script that can connect directly to my brokerage accounts on Angel, mStock, or Zerodha and place stock orders for me. The script’s only required job right now is to execute trades—no price monitoring or reporting is necessary at this stage. Please build the script so I can trigger an order with simple parameters such as symbol, order type, quantity, price, and product type. Authentication with each broker’s REST API must be handled securely (token refresh, key storage, etc.) and the code should be well-commented so I can extend it later if I decide to add price monitoring or reporting. If you have previous experience integrating Google Apps Script with Angel, mStock, Zerodha, or similar trading APIs, let me know. A short demo showing a sandbox or live test order will be the acceptance criterion.