Instrument key for puling option contract and chain

Developer API
2

@Jigar_Patel, you can find the instrument key by trading_symbol with other fields like segment and short_name.

Below is json for ICICIBANK

 {
        "segment": "NSE_EQ",
        "name": "ICICI BANK LTD.",
        "exchange": "NSE",
        "isin": "INE090A01021",
        "instrument_type": "EQ",
        "instrument_key": "NSE_EQ|INE090A01021",
        "lot_size": 1,
        "freeze_quantity": 100000.0,
        "exchange_token": "4963",
        "tick_size": 5.0,
        "trading_symbol": "ICICIBANK",
        "short_name": "ICICI Bank",
        "security_type": "NORMAL"
    }