Yii2 oauth2 client_credential token authentication - authentication

Question

I use Filsh/yii2-oauth2-server,
I can use client token using $_pos to access my API.
In controller:
if (!isset($_post['token'])){
//exeption
}
else{
token = $_post('token');
}
if ((Accesstokens::isAccessTokenValid($token))) {
// do some thing.
}
in my Accesstokens model :
public static function isAccessTokenValid($token)
{
if (empty($token)) {
return false;
}
$query = (new \yii\db\Query())
->select(['access_token','expires'])
->from('oauth_access_tokens')
->where(['access_token' => $token])
// ->limit(10)
->one();
if (empty($query)) {
return false;
}
$expire = $query['expires'];
return $expire > date('Y-m-d h:i:s');
}
If I use password (user_credential) token, I can implementation bearer auth using :
public function behaviors()
{
return ArrayHelper::merge(parent::behaviors(), [
'authenticator' => [
'class' => CompositeAuth::className(),
'authMethods' => [
['class' => HttpBearerAuth::className()],
['class' => QueryParamAuth::className(), 'tokenParam' => 'accessToken'],
]
],
'exceptionFilter' => [
'class' => ErrorToExceptionFilter::className()
],
]);
}
But this method is using user table in authenticate user, not oauth_client table to authenticate client without user.
How to authenticate token base on client table only, without user table?
Request:
GET http://myapi.com/api/www/index.php/oauth2/token
grand_type = client_credentials
client_id = id1
client_secret = secret1
Response:
"access_token": "thisistheccesstoken",
"expires_in": 31104000,
"token_type": "Bearer",
"scope": "default"
Request:
GET http://myapi.com/api/www/index.php/oauth2/v1/get/frogs
HEADER Authorization: Bearer thisistheaccesstoken
Response:
all the frogs
How to use: HEADER Authorization: Bearer? Can anyone help?