return rest.postForEntity(
                "https://api.tosspayments.com/v1/payments/confirm",
                new HttpEntity<>(param, headers),
                TossPaymentSuccessDto.class
        ).getBody();

        return rest.postForEntity(
                "https://api.tosspayments.com/v1/payments/confirm",
                new HttpEntity<>(param, headers),
                TossPaymentSuccessDto.class
        ).getBody();

        URL url = new URL(PAYMENT_URL + paymentKey);
        URI uri = URI.create(String.valueOf(url));
        
        return rest.postForEntity(
                uri,
                new HttpEntity<>(param, headers),
                TossPaymentSuccessDto.class
        ).getBody();

        URL url = new URL(PAYMENT_URL + paymentKey);
        URI uri = URI.create(String.valueOf(url));
        
        return rest.postForEntity(
                uri,
                new HttpEntity<>(param, headers),
                TossPaymentSuccessDto.class
        ).getBody();