getPostalCodeRequired example

        if (!$constraint instanceof CustomerZipCode) {
            throw new UnexpectedTypeException($constraint, CustomerZipCodeValidator::class);
        }

        if ($constraint->countryId === null) {
            return;
        }

        $country = $this->getCountry($constraint->countryId);

        if ($country->getPostalCodeRequired()) {
            if ($value === null || $value === '') {
                $this->context->buildViolation($constraint->getMessageRequired())
                    ->setCode(NotBlank::IS_BLANK_ERROR)
                    ->addViolation();

                return;
            }
        }

        if (!$country->getCheckPostalCodePattern() && !$country->getCheckAdvancedPostalCodePattern()) {
            return;
        }