public function captureSale($paymentId, $amount = null, $serviceTaxAmount = null)
    {
        $updateSaleRequest = new UpdateSaleRequest('capture', $this->merchant, $this->environment);

        $updateSaleRequest->setAmount($amount);
        $updateSaleRequest->setServiceTaxAmount($serviceTaxAmount);

        return $updateSaleRequest->execute($paymentId);
    }