Authentication problem

I am getting following response when I am trying authorize my app  and it is not going through. 

 

The php code I am using is also pasted below

<?php
$clientID = '{API Key}';
$url = urlencode("https://{mysite}/myob/callback.php");
$ch = curl_init();
$customHeaders = array(
    'Content-Type: application/x-www-form-urlencoded'
);
curl_setopt($ch, CURLOPT_HTTPHEADER, $customHeaders);
curl_setopt($ch, CURLOPT_URL, "https://secure.myob.com/oauth2/Account/Login?client_id=". $clientID  ."redirect_uri=". $url ."&response_type=code&scope=la.global");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
$data = curl_exec($ch);
echo $data;
?>

 

Please let me know what I am doing wrong.

 

Thank you

Bhaska Barui