Elysia

better-payment/elysia mounts the payment handler on an Elysia route. Elysia is built for Bun and also runs on Node.js.

1. Create the payment instanceCopy Anchor Link

// payment.ts
import { betterPayment, iyzico } from 'better-payment';

export const payment = betterPayment({
  mode: process.env.NODE_ENV === 'production' ? 'production' : 'sandbox',
  providers: {
    iyzico: iyzico({
      apiKey: process.env.IYZICO_API_KEY!,
      secretKey: process.env.IYZICO_SECRET_KEY!,
    }),
  },
  handler: {
    onCallback: async (result) => markOrder(result.paymentId, result.status),
    callbackRedirect: (result) => `/orders/${result.paymentId}?payment=${result.status}`,
  },
});

See configuration for every option and handler for allowedActions, transformRequest and the other handler hooks.

2. Mount the handlerCopy Anchor Link

// server.ts
import { Elysia } from 'elysia';
import { toElysiaHandler } from 'better-payment/elysia';
import { payment } from './payment';

new Elysia()
  .all('/api/pay/*', toElysiaHandler(payment), { parse: 'none' })
  .listen(3000);

{ parse: 'none' } keeps the raw body for the handler: bank callbacks are form-urlencoded and their signatures are checked against the original fields. Without it, any hook that reads body (onTransform, derive, onBeforeHandle or a plugin) makes Elysia consume the request first.

3. Start a paymentCopy Anchor Link

The routes are served under /api/pay, so the frontend calls them directly:

const res = await fetch('/api/pay/iyzico/payment/init-3ds', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify(paymentRequest),
});

The typed client (better-payment/client) wraps the same routes.

4. Callback URLsCopy Anchor Link

Set callbackUrl to https://yoursite.com/api/pay/<provider>/payment/complete-3ds. The handler verifies the callback, calls onCallback and redirects the customer with callbackRedirect.

For PayTR, set the notification URL in the PayTR panel to https://yoursite.com/api/pay/paytr/callback.