How to integrate Stripe without a website

1const express = require('express');
2const stripe = require('stripe')(process.env.STRIPE_SECRET_KEY);
3
4const app = express();
5app.use(express.json());
6
7// Create a Payment Link
8app.post('/api/payment-links', async (req, res) => {
9  try {
10    const { productName, amount, recurring } = req.body;
11
12    const priceData = {
13      currency: 'usd',
14      product_data: { name: productName },
15      unit_amount: amount, // in cents
16    };
17
18    if (recurring) {
19      priceData.recurring = { interval: 'month' };
20    }
21
22    const paymentLink = await stripe.paymentLinks.create({
23      line_items: [{ price_data: priceData, quantity: 1 }],
24    });
25
26    res.json({ url: paymentLink.url, id: paymentLink.id });
27  } catch (err) {
28    res.status(500).json({ error: err.message });
29  }
30});
31
32// Create and send an invoice
33app.post('/api/invoices', async (req, res) => {
34  try {
35    const { customerEmail, items, daysUntilDue } = req.body;
36
37    // Find or create customer
38    let customers = await stripe.customers.list({ email: customerEmail, limit: 1 });
39    let customer = customers.data[0];
40    if (!customer) {
41      customer = await stripe.customers.create({ email: customerEmail });
42    }
43
44    // Create invoice
45    const invoice = await stripe.invoices.create({
46      customer: customer.id,
47      collection_method: 'send_invoice',
48      days_until_due: daysUntilDue || 30,
49    });
50
51    // Add line items
52    for (const item of items) {
53      await stripe.invoiceItems.create({
54        customer: customer.id,
55        invoice: invoice.id,
56        description: item.description,
57        amount: item.amount, // in cents
58        currency: 'usd',
59      });
60    }
61
62    // Finalize and send
63    await stripe.invoices.finalizeInvoice(invoice.id);
64    await stripe.invoices.sendInvoice(invoice.id);
65
66    res.json({ id: invoice.id, status: 'sent' });
67  } catch (err) {
68    res.status(500).json({ error: err.message });
69  }
70});
71
72const PORT = process.env.PORT || 3000;
73app.listen(PORT, () => console.log(`Server on port ${PORT}`));