hello everyone
with respect i want to know what is the instument key for banknifty and gold option chain with all strike price of any expiry .
Is there any update on where we can get a historical instrument key (for the expired contracts)? We need this to backtest the strategies. Could you please give us another instrument file containing all the expired contracts as well, otherwise there is no use of the historical data API as we can’t fetch anything without an instrument key