Nepal's Payment Gateways.
One Library. Zero Boilerplate.

HttpClient client = HttpClient.newHttpClient();

String json = """
    {
      "return_url": "%s",
      "website_url": "%s",
      "amount": %d,
      "purchase_order_id": "%s",
      "purchase_order_name": "%s"
    }
    """.formatted(returnUrl, url, amount, id, name);

HttpRequest req = HttpRequest.newBuilder()
    .uri(URI.create(
        "https://dev.khalti.com/api/v2/epayment/initiate/"))
    .header("Authorization", "Key " + secretKey)
    .header("Content-Type", "application/json")
    .POST(BodyPublishers.ofString(json))
    .build();

// parse manually, handle errors manually,
// write HMAC for eSewa manually,
// repeat for every new project...

// Zero @Bean. Zero @EnableNepalPay.
@Service
@RequiredArgsConstructor
public class PaymentService {

    private final KhaltiClient khaltiClient;

    public String initiate(
            String orderId, long nprAmount) {

        var res = khaltiClient.initiatePayment(
            KhaltiInitiateRequest.builder()
                .amount(nprAmount * 100L)
                .purchaseOrderId(orderId)
                .purchaseOrderName("Pro Plan")
                .build()
        );

        // Save pidx to DB, then redirect:
        return res.paymentUrl();
    }
}