TaxCalculator::findVatRateOrDefault

private function findVatRateOrDefault(?int $vatId): array
{
	$vat = null;
	if ($vatId)
	{
		$vatRates = $this->loadVatRates();
		foreach ($vatRates as $rate)
		{
			if ((int)$rate['ID'] === $vatId)
			{
				$vat = $rate;
				break;
			}
		}
	}

	if (empty($vat))
	{
		$vat = $this->loadDefaultVatRate();
	}

	return $vat;
}