If i have purchased api access then only i have api key and secret key. Then why it asks for login to execute url to get request token? It must execute based on api key and secret key only.
It is mandatory by the exchange that a trader has to manually login at least once a day. You can generate an access token in the morning by logging in and use it for the whole day.
Once you get an access token it is valid for one whole day. You will have to log in the next day before the trading session. You can know more about it here.
You need to login to generate request token. Go through this part of the documentation.
You can generate an access token in the morning by logging in and use it for the whole day.