@22rostislav I just checked with valid access token and api key and it seems to be working fine. Please recheck if your access token and api key combination is right and user didn't logout from kite.
I tried by changing the secret key. My app expiry date is till Nov 18, 2017. Getting error: {"status": "error", "error_type": "TokenException", "message": "Invalid API credentials"}
@pankajrb Can you please pm your access_token, api_key and user_id so that I can check here. Also make sure that you dont logout after generating the access token.