public function successCallback($client)
{
ApiService::saveToken($client->id, $client->accessToken);
}
/**
* Saves token in DB.
* @param OAuthToken $token
* @return ApiService|null|\yii\db\ActiveQuery|\yii\db\ActiveRecord|static
*/
protected function saveAccessToken(OAuthToken $token)
{
return ApiService::saveToken($this->id, $token);
}