Vanilla JavaScript / Any Platform

Works in any Node.js backend, Deno, Bun, Cloudflare Workers, or browser (session creation must be server-side).

npm install @swft-checkout/js

Express

import express from 'express'
import { createSession, verifySwftWebhookNode } from '@swft-checkout/js'

const app = express()

// Checkout endpoint — redirects to Swft
app.post('/checkout', async (req, res) => {
  const session = await createSession({
    merchantApiKey:  process.env.SWFT_MERCHANT_API_KEY,
    currency:        'GBP',
    lineItems:       req.body.items,
    shippingMethods: [{ id: 'standard', label: 'Standard', cost: 499 }],
    subtotal:        req.body.subtotal,
  })
  res.redirect(session.sessionUrl)
})

// Webhook
app.post('/webhooks/swft', express.raw({ type: 'application/json' }), (req, res) => {
  const payload = verifySwftWebhookNode(
    req.body,
    req.headers['x-swft-signature'] as string,
    process.env.SWFT_WEBHOOK_SECRET
  )
  // handle payload.event === 'payment_succeeded'
  res.json({ received: true })
})

Cloudflare Workers / Deno / Bun

Use verifySwftWebhook (async, Web Crypto API) instead of verifySwftWebhookNode.