Voucher sync with Ocard

 public function actionSynchronizeCoupons() {
        set_time_limit(0);
        ini_set('memory_limit', '-1');
        $event = Event::findOne(Customer::getCurrentUserDefaultEventID());
        $coupons = Coupon::find()
            ->joinWith('participant')
            ->where(['participant.event_id' => Customer::getCurrentUserDefaultEventID()])
            ->andWhere(['>=', 'coupon.id', 3400])
            ->all();
        foreach ($coupons as $coupon) {
            $coupon->synchronizeCoupon($event);
        }
        Yii::$app->session->setFlash('success', Yii::t('Coupon', "Synchronization completed"));
        $this->redirect('index');
    }