How to use Stripe Tax for automatic sales tax

1// stripe-tax-checkout.js
2// Node.js Express server with Stripe Tax enabled
3
4const express = require('express');
5const Stripe = require('stripe');
6const stripe = Stripe(process.env.STRIPE_SECRET_KEY);
7const app = express();
8
9app.use(express.json());
10
11// Create a product with tax code
12app.post('/api/create-product', async (req, res) => {
13  try {
14    const product = await stripe.products.create({
15      name: req.body.name,
16      tax_code: 'txcd_10103001'  // SaaS
17    });
18
19    const price = await stripe.prices.create({
20      product: product.id,
21      unit_amount: req.body.amount,
22      currency: 'usd',
23      tax_behavior: 'exclusive'
24    });
25
26    res.json({ product_id: product.id, price_id: price.id });
27  } catch (err) {
28    res.status(400).json({ error: err.message });
29  }
30});
31
32// Create Checkout Session with automatic tax
33app.post('/api/create-checkout', async (req, res) => {
34  try {
35    const session = await stripe.checkout.sessions.create({
36      mode: 'payment',
37      line_items: [{
38        price: req.body.price_id,
39        quantity: 1
40      }],
41      automatic_tax: { enabled: true },
42      success_url: `${req.headers.origin}/success?session_id={CHECKOUT_SESSION_ID}`,
43      cancel_url: `${req.headers.origin}/cancel`
44    });
45
46    res.json({ url: session.url });
47  } catch (err) {
48    res.status(400).json({ error: err.message });
49  }
50});
51
52// Retrieve tax details for a completed session
53app.get('/api/tax-details/:session_id', async (req, res) => {
54  try {
55    const session = await stripe.checkout.sessions.retrieve(
56      req.params.session_id,
57      { expand: ['total_details.breakdown'] }
58    );
59
60    res.json({
61      subtotal: session.amount_subtotal,
62      tax: session.total_details.amount_tax,
63      total: session.amount_total,
64      breakdown: session.total_details.breakdown
65    });
66  } catch (err) {
67    res.status(400).json({ error: err.message });
68  }
69});
70
71app.listen(3001, () => console.log('Server on port 3001'));