How to get the new acces token with refresh token

[Deep21]

Hello all,

I am trying to get a new acces token by adding the refresh token on the body request:
{
"grant_type":"refresh_token",
"client_id":"",
"client_secret":"",
"refresh_token": "e1f28c7f460dfa076d675937a574c0c856f56298"
}

But I got this error:
{
"error": "unauthorized_client",
"error_description": "The grant type is unauthorized for this client_id"
}

Here my PHP code:
require_once('src/OAuth2/Autoloader.php');
OAuth2\Autoloader::register();

// $dsn is the Data Source Name for your database, for exmaple "mysql:dbname=my_oauth2_db;host=localhost"
$storageD = new OAuth2\Storage\Pdo(array('dsn' => $dsn, 'username' => $username, 'password' => $password));

// create a storage object

$server = new OAuth2\Server($storageD);
$grantTypeR = new OAuth2\GrantType\RefreshToken($storageD);
$grantType = new OAuth2\GrantType\UserCredentials($storageD);
$server->addGrantType($grantType);
$server->addGrantType($grantTypeR);

But when I edit on the db the grant_type to refresh_token that's work !

[bshaffer]

Your client ID is empty... You must supply a client ID and your storage engine in turn must support that client ID / client secret combination.

[Deep21]

Even when I fill the client IDn I've got the same error:
{
"error": "unauthorized_client",
"error_description": "The grant type is unauthorized for this client_id"
}

but when I edit the grant_types table in the db to refresh_token that's work .

[bshaffer]

Does your server know about the client id / secret you're using?

[Deep21]

yea, I insert clientid/clientsecret in the db

[bshaffer]

the error The grant type is unauthorized for this client_id implies that the client_id is valid, but the grant type you're using is not. Add "refresh_token password" to your "grant_types" field in the DB, and that should fix the issue.

[Deep21]

Great ! How can I found this information ? i didnt see any informations about this issue.