npm init -y
npm install express @paybridgejs/khalti
npm install -D typescript @types/express ts-node

import { khalti } from "@paybridgejs/khalti";

export const Khalti = new khalti({
  secretKey: process.env.KHALTI_SECRET_KEY!,
});

import express from "express";
import { Khalti } from "../lib/khalti";

const app = express();
const PORT = 3000;

app.use(express.json());

// Route: Initiate payment
app.post("/api/initiate", async (req, res) => {
  try {
    const payment = await Khalti.initiate({
      amount: 1000,
      purchase_order_id: "ORDER-1",
      purchase_order_name: "Test Product",
      return_url: "http://localhost:3000/success",
      website_url: "http://localhost:3000",
    });

    res.json(payment);
  } catch (error) {
    console.error("Payment initiation failed:", error);
    res.status(500).json({ error: "Payment initiation failed" });
  }
});

// Route: Verify payment
app.post("/api/verify", async (req, res) => {
  try {
    const { pidx } = req.body;

    if (!pidx) {
      return res.status(400).json({
        verified: false,
        message: "Missing payment ID",
      });
    }

    const data = await Khalti.verify({ pidx });

    if (data.status === "Completed") {
      return res.json({
        verified: true,
        message: "Payment verified successfully",
        status: data.status,
        data,
      });
    }

    return res.status(400).json({
      verified: false,
      message: `Payment is ${data.status.toLowerCase()}`,
      status: data.status,
      data,
    });
  } catch (error) {
    console.error("VERIFY ERROR:", error);

    res.status(400).json({
      verified: false,
      message: error instanceof Error ? error.message : "Verification failed",
    });
  }
});

// Health check
app.get("/", (req, res) => {
  res.json({ status: "OK", message: "PayBridge Express Server" });
});

app.listen(PORT, () => {
  console.log(`✅ Server running at http://localhost:${PORT}`);
});

# Start server
npm run dev

# Initiate payment
curl -X POST http://localhost:3000/api/initiate

# Verify payment
curl -X POST http://localhost:3000/api/verify \
  -H "Content-Type: application/json" \
  -d '{ "pidx": "your_pidx_here" }'

KHALTI_SECRET_KEY=your_khalti_secret_key

npx ts-node src/server.ts