isValidPrice example

public function deserialize(Config $config, Field $field, $record): ?array
    {
        $prices = [];

        if (!\is_array($record)) {
            return null;
        }

        foreach ($record as $currencyIso => $price) {
            $currency = $this->getCurrencyIdFromIso($currencyIso);

            if ($currency === null || !$this->isValidPrice($price)) {
                continue;
            }

            $listPrice = null;
            if (isset($price['listPrice']) && $this->isValidPrice($price['listPrice'])) {
                $listPrice = new Price($currency, (float) $price['listPrice']['net'], (float) $price['listPrice']['gross'], (bool) ($price['listPrice']['linked'] ?? false));
            }

            $priceStruct = new Price($currency, (float) $price['net'], (float) $price['gross'], (bool) ($price['linked'] ?? false), $listPrice);
            $prices[$currency] = $priceStruct->jsonSerialize();