💳 Payment Gateway কেন প্রয়োজন?

• Online payment collect করার জন্য
• Subscription / Course selling
• Secure & trusted transaction
• Auto invoice ও payment tracking

🧩 Razorpay Integration (Express.js)

📦 Install Packages

npm install razorpay crypto
      

⚙️ Backend Code (Express.js)

const Razorpay = require("razorpay");
const crypto = require("crypto");

const razorpay = new Razorpay({
  key_id: process.env.RAZORPAY_KEY_ID,
  key_secret: process.env.RAZORPAY_KEY_SECRET,
});

app.post("/create-order", async (req, res) => {
  const options = {
    amount: 50000, // 500 INR
    currency: "INR",
    receipt: "order_rcptid_11",
  };

  const order = await razorpay.orders.create(options);
  res.json(order);
});

app.post("/verify-payment", (req, res) => {
  const { razorpay_order_id, razorpay_payment_id, razorpay_signature } = req.body;

  const sign = razorpay_order_id + "|" + razorpay_payment_id;
  const expectedSign = crypto
    .createHmac("sha256", process.env.RAZORPAY_KEY_SECRET)
    .update(sign)
    .digest("hex");

  if (expectedSign === razorpay_signature) {
    res.json({ success: true });
  } else {
    res.json({ success: false });
  }
});
      

🧩 Stripe Integration (Express.js)

📦 Install Package

npm install stripe
      

⚙️ Backend Code (Express.js)

const stripe = require("stripe")(process.env.STRIPE_SECRET_KEY);

app.post("/create-payment-intent", async (req, res) => {
  const paymentIntent = await stripe.paymentIntents.create({
    amount: 50000, // 500 INR
    currency: "inr",
    automatic_payment_methods: {
      enabled: true,
    },
  });

  res.send({
    clientSecret: paymentIntent.client_secret,
  });
});