public function reset()
    {

        $this->token_type = '';

        $this->access_token = '';
        $this->expires_in = 0;
        $this->expire_time = 0;

        $this->refresh_token = '';
        $this->refresh_token_expires_in = 0;
        $this->refresh_token_expire_time = 0;

        $this->scope = '';
        $this->owner_id = '';

        return $this;

    }