hookdeck/webhook-skills/intercom-webhooks

const crypto = require('crypto');
function verifyIntercomWebhook(rawBody, signatureHeader, clientSecret) {
  if (!signatureHeader || !clientSecret) return false;
  // Intercom sends: sha1=<hex>
  const [algorithm, signature] = signatureHeader.split('=');
  if (algorithm !== 'sha1' || !signature) return false;
  const expected = crypto
    .createHmac('sha1', clientSecret)
    .update(rawBody)
    .digest('hex');
  try {
    return crypto.timingSafeEqual(
      Buffer.from(signature, 'hex'),
      Buffer.from(expected, 'hex')
    );
  } catch {
    return false;
  }
}

const express = require('express');
const app = express();
// CRITICAL: Use express.raw() — Intercom signs the raw body, not parsed JSON
app.post('/webhooks/intercom',
  express.raw({ type: 'application/json' }),
  (req, res) => {
    const signature = req.headers['x-hub-signature'];
    // Verify signature
    if (!verifyIntercomWebhook(req.body, signature, process.env.INTERCOM_CLIENT_SECRET)) {
      console.error('Intercom signature verification failed');
      return res.status(401).send('Invalid signature');
    }
    // Parse the payload after verification
    const notification = JSON.parse(req.body.toString());
    const topic = notification.topic;
    console.log(`Received ${topic} (notification id: ${notification.id})`);
    // Handle by topic
    switch (topic) {
      case 'ping':
        // Handshake when you save the webhook in the Developer Hub
        console.log('Ping received');
        break;
      case 'conversation.user.created':
        console.log('New conversation from user:', notification.data.item.id);
        break;
      case 'conversation.user.replied':
        console.log('User replied:', notification.data.item.id);
        break;
      case 'conversation.admin.replied':
        console.log('Admin replied:', notification.data.item.id);
        break;
      case 'conversation.admin.assigned':
        console.log('Conversation assigned:', notification.data.item.id);
        break;
      case 'contact.user.created':
        console.log('New user:', notification.data.item.id);
        break;
      case 'contact.lead.created':
        console.log('New lead:', notification.data.item.id);
        break;
      case 'ticket.created':
        console.log('New ticket:', notification.data.item.id);
        break;
      default:
        console.log('Unhandled topic:', topic);
    }
    res.status(200).send('OK');
  }
);

import hmac
import hashlib
def verify_intercom_webhook(raw_body: bytes, signature_header: str, client_secret: str) -> bool:
    if not signature_header or not client_secret:
        return False
    # Intercom sends: sha1=<hex>
    try:
        algorithm, signature = signature_header.split("=", 1)
    except ValueError:
        return False
    if algorithm != "sha1" or not signature:
        return False
    expected = hmac.new(
        client_secret.encode("utf-8"),
        raw_body,
        hashlib.sha1,
    ).hexdigest()
    return hmac.compare_digest(signature, expected)

{
  "type": "notification_event",
  "app_id": "abc123",
  "data": {
    "type": "notification_event_data",
    "item": { "type": "conversation", "id": "...", "...": "..." }
  },
  "links": {},
  "id": "notif_<unique_id>",
  "topic": "conversation.user.created",
  "delivery_status": "pending",
  "delivery_attempts": 1,
  "delivered_at": 0,
  "first_sent_at": 1700000000,
  "created_at": 1700000000
}

# Your app's client_secret from Developer Hub → Basic Info
INTERCOM_CLIENT_SECRET=your_app_client_secret

# Forward webhooks to localhost (no account required)
npx hookdeck-cli listen 3000 intercom --path /webhooks/intercom

// Generated with: intercom-webhooks skill
// https://github.com/hookdeck/webhook-skills