Comment automatiser la facturation avec Stripe en 2026

mkdir billing-automation && cd billing-automation
npm init -y
npm install express stripe pdfkit nodemailer @types/node @types/express dotenv stripe-node-webhook
npm install -D typescript ts-node @types/pdfkit @types/nodemailer
npx tsc --init --target es2022 --module commonjs --outDir ./dist --rootDir ./src --strict

import express from 'express';
import dotenv from 'dotenv';
import { Stripe } from 'stripe-node-webhook';

dotenv.config();

const app = express();
app.use(express.raw({ type: 'application/json' }));
app.use(express.json());

const stripe = new Stripe({
  webhookSecret: process.env.STRIPE_WEBHOOK_SECRET!,
  apiKey: process.env.STRIPE_SECRET_KEY!
});

const PORT = 3000;

app.listen(PORT, () => {
  console.log(`Serveur billing sur port ${PORT}`);
});

export { app, stripe };

import { app, stripe } from './server';
import { generateInvoicePDF, sendInvoiceEmail } from './invoice';

app.post('/webhook', async (req, res) => {
  try {
    const event = await stripe.parseWebhookRequest(req);
    if (event.type === 'invoice.paid') {
      const invoice = event.data.object as any;
      await generateInvoicePDF(invoice);
      await sendInvoiceEmail(invoice.customer_email, invoice.hosted_invoice_url);
    } else if (event.type === 'invoice.payment_failed') {
      console.log('Paiement échoué:', event.data.object);
    }
    res.status(200).json({ received: true });
  } catch (err) {
    console.error('Webhook error:', err);
    res.status(400).send(`Webhook Error: ${err}`);
  }
});

import PDFDocument from 'pdfkit';
import fs from 'fs';

export async function generateInvoicePDF(invoice: any): Promise<string> {
  return new Promise((resolve, reject) => {
    const doc = new PDFDocument();
    const filename = `./invoices/${invoice.id}.pdf`;
    doc.pipe(fs.createWriteStream(filename));

    doc.fontSize(25).text('Facture', 50, 50);
    doc.fontSize(12).text(`ID: ${invoice.id}`, 50, 100);
    doc.text(`Montant: ${invoice.amount_paid / 100}€`, 50, 120);
    doc.text(`Client: ${invoice.customer_email}`, 50, 140);
    doc.text(`Date: ${new Date(invoice.created * 1000).toLocaleDateString('fr-FR')}`, 50, 160);

    doc.end();
    doc.on('end', () => resolve(filename));
    doc.on('error', reject);
  });
}

import nodemailer from 'nodemailer';

export async function sendInvoiceEmail(email: string, invoiceUrl: string): Promise<void> {
  const transporter = nodemailer.createTransporter({
    host: process.env.SMTP_HOST,
    port: Number(process.env.SMTP_PORT),
    secure: false,
    auth: {
      user: process.env.SMTP_USER,
      pass: process.env.SMTP_PASS
    }
  });

  // Attachez PDF généré
  await transporter.sendMail({
    from: process.env.SMTP_USER,
    to: email,
    subject: 'Votre facture est disponible',
    html: `<p>Facture attachée. <a href="${invoiceUrl}">Voir en ligne</a></p>`,
    attachments: [{ path: `./invoices/${invoiceUrl.split('/').pop()!}.pdf` }]
  });
}