KITE3 Login flow

Hi,

In the previous version of kite, I used to copy the login_url into the browser and get the request token. How do I get the request_token in Kite3?
I am getting something like this:-

https://kite.zerodha.com/connect/authorize?sess_id=5lk9orjnpcjzipasey49xiti8c9cnobn&v=3

Page output.
{
"error_type": "NetworkException",
"message": "Request failed.",
"status": "error"
}

Is session id the request token?

Thanks,
Ansuman