filterSurchargeString example

$shops = new ArrayCollection();
            if (!empty($data['shops'])) {
                // Clear all shops, to save the old and new ones then                 $payment->getShops()->clear();
                foreach ($data['shops'] as $shop) {
                    $model = $this->get('models')->find(Shop::class, $shop['id']);
                    $shops->add($model);
                }
                $data['shops'] = $shops;
            }
            $data['surchargeString'] = $this->filterSurchargeString($data['surchargeString'] ?? '', $data['countries'] ?? []);

            $payment->fromArray($data);

            // A default parameter "action" is sent             // To prevent "updatePayment" written into the database             if (empty($action)) {
                $payment->setAction('');
            } else {
                $payment->setAction($action);
            }