How to update a payment method via Stripe API

1const express = require('express');
2const stripe = require('stripe')(process.env.STRIPE_SECRET_KEY);
3
4const app = express();
5app.use(express.json());
6
7// Replace the default payment method for a customer
8app.post('/api/customers/:customerId/payment-method', async (req, res) => {
9  try {
10    const { customerId } = req.params;
11    const { paymentMethodId } = req.body;
12
13    if (!paymentMethodId) {
14      return res.status(400).json({ error: 'paymentMethodId is required' });
15    }
16
17    // Get current default payment method
18    const customer = await stripe.customers.retrieve(customerId);
19    const oldDefault = customer.invoice_settings?.default_payment_method;
20
21    // Attach new payment method
22    await stripe.paymentMethods.attach(paymentMethodId, {
23      customer: customerId,
24    });
25
26    // Set as default
27    await stripe.customers.update(customerId, {
28      invoice_settings: {
29        default_payment_method: paymentMethodId,
30      },
31    });
32
33    // Detach old payment method if it exists
34    if (oldDefault && oldDefault !== paymentMethodId) {
35      await stripe.paymentMethods.detach(oldDefault);
36    }
37
38    res.json({
39      message: 'Payment method updated',
40      newDefault: paymentMethodId,
41      oldDetached: oldDefault || null,
42    });
43  } catch (err) {
44    console.error('Payment method update error:', err.message);
45    res.status(500).json({ error: err.message });
46  }
47});
48
49// Update billing details on existing payment method
50app.patch('/api/payment-methods/:pmId', async (req, res) => {
51  try {
52    const { billing_details } = req.body;
53    const updated = await stripe.paymentMethods.update(req.params.pmId, {
54      billing_details,
55    });
56    res.json({ id: updated.id, billing_details: updated.billing_details });
57  } catch (err) {
58    res.status(500).json({ error: err.message });
59  }
60});
61
62const PORT = process.env.PORT || 3000;
63app.listen(PORT, () => console.log(`Server on port ${PORT}`));