gistfile1.txt

http://coop.apps.knpuniversity.com/token
    ?client_id=Your+Client+Name
    &client_secret=abcdefg
    &grant_type=client_credentials


$request = $http->post('/token', null, array(
    'client_id'     => 'Brent\'s Lazy CRON Job',
    'client_secret' => 'a2e7f02def711095f83f2fb04ecbc0d3',
    'grant_type'    => 'client_credentials',
));


{
  "access_token": "fa3b4e29d8df9900816547b8e53f87034893d84c",
  "expires_in": 86400,
  "token_type": "Bearer",
  "scope": "chickens-feed"
}