Define the API endpoints

login_url = 'https://smartapi.angelbroking.com/rest/auth/login'
market_data_url = 'https://smartapi.angelbroking.com/rest/secure/angelbroking/currentdayextremes'

Prepare the request headers for authentication

headers = {
'Content-Type': 'application/x-www-form-urlencoded',
}

Prepare the request data for authentication

data = {
'api_key': api_key,
'password': api_secret,
}

Authenticate and obtain an access token

response = requests.post(login_url, data=data, headers=headers)
if response.status_code == 200:
access_token = response.json()['data']['accessToken']

# Prepare headers for fetching market data with the access token
headers = {
    'Authorization': f'Bearer {access_token}',
    'Content-Type': 'application/json',
}

# Fetch today's Bank Nifty price
response = requests.get(market_data_url, headers=headers)

if response.status_code == 200:
    try:
        market_data = response.json()
        today_banknifty_price = market_data['data']['CASH']['BANKNIFTY']
        print(f"Today's Bank Nifty Price: {today_banknifty_price}")
    except json.JSONDecodeError:
        print("Error: Unable to decode JSON response.")
else:
    print(f"Error fetching market data: {response.status_code} - {response.text}")

else:
print(f"Authentication error: {response.status_code} - {response.text}")

kindly please guide where I am doing mistake.