Create Pluggable Multi-Gateway Payment Module (Stripe, Razorpay + More) 💳

🧩 Description

Build a modular, multi-gateway, and plug-and-play payment module that supports popular gateways like Razorpay and Stripe, while allowing developers to easily add new providers (like PayPal, Cashfree, etc.) in the future.

This feature should be:

• Provider-agnostic from the top-level controller/servi

• Developer-configurable (choose provider via config)

• Secure (signature verification, safe token handling)

• Reusable across apps (SaaS, ecommerce, donation, subscriptions)

🧱 Why This Is Important

• ✅ Real-world apps need robust payment handling

• 💼 Companies use different gateways based on country or pricing

• 🛠 Avoids duplicating logic across Stripe, Razorpay, etc.

• 🧩 Developers can choose & plug only what they need

• 🚀 Makes monetization & checkout easier and faster to ship

• 🟢 Difficulty Level: Intermediate to Advanced

Needs experience with:

• Payment flows (Checkout Sessions, Payment Intents)

• Signature verification

• SDKs (Stripe, Razorpay)

• Middleware and secure architecture

✅ Tasks

1. 📁 Proposed Folder Structure

src/
└── features/
    └── Payment/
        └── v1/
            ├── Payment.controller.ts         # Handles routes
            ├── Payment.service.ts            # Gateway-agnostic manager
            ├── Payment.constant.ts           # Errors, messages
            ├── Payment.validators.ts         # Joi/Zod for inputs
            ├── Payment.model.ts              # Optional: track transactions
            ├── Payment.middleware.ts         # Signature verification, etc.
            ├── Payment.config.ts             # Environment config
            ├── Payment.demo.ts               # Sample usage
            ├── README.md
            ├── stripe/
            │   ├── Stripe.service.ts         # Stripe logic
            │   ├── Stripe.config.ts
            ├── razorpay/
            │   ├── Razorpay.service.ts       # Razorpay logic
            │   ├── Razorpay.config.ts
            └── gateway/
                ├── types.ts                  # Gateway interface
                └── index.ts                  # Gateway factory

2. 🧩 Core Payment Gateway Interface (gateway/types.ts)

• Define a common structure all providers must follow:

export interface IPaymentGateway {
  createPayment(data: PaymentData): Promise<PaymentResponse>;
  verifyPayment(payload: any): Promise<VerificationResult>;
}

All providers must implement this.

3. 🧠 Gateway Factory (gateway/index.ts)

Return the right gateway instance based on config:

import StripeGateway from '../stripe/Stripe.service';
import RazorpayGateway from '../razorpay/Razorpay.service';

export const getPaymentGateway = (provider: string) => {
  switch (provider) {
    case 'stripe':
      return new StripeGateway();
    case 'razorpay':
      return new RazorpayGateway();
    default:
      throw new Error('Unsupported payment provider');
  }
};

4. 🎮 Controller (Payment.controller.ts)

• startPayment(req, res)

• verifyPayment(req, res)

• [ ] Internally uses:

const gateway = getPaymentGateway(process.env.PAYMENT_PROVIDER); 

5. ⚙️ Service (Payment.service.ts)

• Acts as a façade layer:

• Handles shared logic like logging

• Calls the correct gateway

• Returns a consistent response format

{
  success: true,
  redirectUrl: 'https://checkout.stripe.com/...',
  transactionId: 'txn_123456'
}

6. 🛡️ Middleware (Payment.middleware.ts)

• Optional: verifySignature() for Razorpay

• Optional: verifyWebhookToken() for Stripe

• Reusable in webhook routes

7. ❗ Constants (Payment.constant.ts)

export const PAYMENT_ERRORS = {
  PROVIDER_NOT_FOUND: 'Payment provider not configured.',
  INVALID_SIGNATURE: 'Signature mismatch.',
  FAILED: 'Transaction failed. Try again later.'
};

8. 📘 README.md

Include:

• How to select provider (via .env)

• How to use PaymentController

• How to verify Razorpay or Stripe responses

• How to add your own gateway in gateway/

9. 🧪 Demo File (Payment.demo.ts)

• Start Stripe & Razorpay sessions

• Sample payloads and mock webhooks

🔌 Supported Providers (Default)

• ✅ Stripe

• SDK-based checkout

• Easy test cards

• ✅ Razorpay

• India-friendly

• Signature-based verification

🧩 Easily extendable to:

• PayPal

• Cashfree

• PhonePe

• Flutterwave

🎯 Example Route Usage

import { verifyToken } from '../auth/Auth.middleware';
import { PaymentController } from '../features/Payment/v1/Payment.controller';

const paymentController = new PaymentController();

router.post('/pay', verifyToken, paymentController.startPayment);
router.post('/pay/verify', verifyToken, paymentController.verifyPayment);

✨ Expected Outcome

[x] One clean API regardless of the payment provider

[x] Pluggable gateway interface

[x] Signature-safe verification for Razorpay

[x] Factory to choose gateway dynamically

[x] Easy future expansion to other providers

[x] Stripe & Razorpay ready out of the box

🙋🏻‍♂️ Looking For

Contributions to:

• Add PayPal, Cashfree, or UPI

• Improve webhook security

• Add metadata support (e.g., productId, userId)

• Enhance transaction model (status, failureReason)

• Write tests for multiple flows (refund, failure, retry)

• Would you like the code scaffolded now or the next issue (like Blog, Upload, or Order) created in this same format?