I am trying to consume a service that I exposed from a project that I have in c #, the problem is that when consuming the service from php I get the following error. {"error":"unsupported_grant_type"}
Code:
function __construct() {
    # data needs to be POSTed to the Play url as JSON.
    # (some code from http://www.lornajane.net/posts/2011/posting-json-data-with-php-curl)
    $data = array("grant_type" => "password", "username" => "Administrador", "password" => "xxxx");
    $data_string = json_encode($data);
    print_r($data_string);
    $ch = curl_init('https://integraciones.intergrupo.com/rest/oauth/token');
    curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
    curl_setopt($ch, CURLOPT_POSTFIELDS, $data_string);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_HTTPHEADER, array(
        'Content-Type: application/x-www-form-urlencoded')
    );
    curl_setopt($ch, CURLOPT_TIMEOUT, 5);
    curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 5);
    //execute post
    $result = curl_exec($ch);
    //close connection
    curl_close($ch);
    echo $result;        // Outputs the JSON decoded data
}
 
    