Client credentials At header

[sajumani]

Hi,

I have attached Client credentials at request header... but its not providing access token

{"error":"invalid_client","error_description":"Client credentials were not found in the headers or body"
}

my header: Array
(
[Host] => MY HOST
[User-Agent] => Mozilla/5.0 (Windows NT 10.0; WOW64; rv:45.0) Gecko/20100101 Firefox/45.0
[Accept] => /
[Accept-Language] => en-US,en;q=0.5
[Accept-Encoding] => gzip, deflate
[Content-Type] => application/x-www-form-urlencoded; charset=UTF-8
[client_id] => MY Client ID
[client_secret] =>
[X-Requested-With] => XMLHttpRequest
[Referer] => DOMAIN/login.php
[Content-Length] => 68
[Cookie] => PHPSESSID=0boeea2s93ac4rfjq0qckcn937
[Connection] => keep-alive
)