Missing api_key on post for access_token

Santosh

Hi,

I am posting

CryptographicHash::Sha256(Api_Key+request_token+Api_Secret)

to url

"https://api.kite.trade/session/token".

I am receiving following message from server:
"{\"status\": \"error\", \"message\": \"Missing api_key\", \"error_type\": \"InputException\"}"

Can you please let me know probable cause of this.


Thanks,
Santosh.