const webhook = await lettr.webhooks.create({
  url: 'https://example.com/webhooks/lettr',
  events: ['email.delivered', 'email.bounced', 'email.opened']
});

{
  "id": "evt_123abc",
  "type": "email.delivered",
  "createdAt": "2024-01-15T10:30:00Z",
  "data": {
    "emailId": "email_xyz",
    "to": "recipient@example.com",
    "subject": "Hello World",
    "deliveredAt": "2024-01-15T10:30:00Z",
    "metadata": {
      "orderId": "order_123"
    }
  }
}

import express from 'express';
import { verifyWebhook } from 'lettr';

const app = express();

app.post('/webhooks/lettr', express.raw({ type: 'application/json' }), (req, res) => {
  const signature = req.headers['lettr-signature'];
  
  try {
    const event = verifyWebhook(req.body, signature, process.env.LETTR_WEBHOOK_SECRET);
    
    switch (event.type) {
      case 'email.delivered':
        console.log('Email delivered:', event.data.emailId);
        break;
      case 'email.bounced':
        console.log('Email bounced:', event.data.to);
        break;
      case 'email.opened':
        console.log('Email opened:', event.data.emailId);
        break;
    }
    
    res.sendStatus(200);
  } catch (err) {
    console.error('Webhook verification failed:', err.message);
    res.sendStatus(400);
  }
});

await lettr.webhooks.test('wh_123', {
  eventType: 'email.delivered'
});