WhatsApp Business Security Best Practices 2025: Complete Protection Guide

// Node.js example
const crypto = require('crypto');

function verifyWebhookSignature(payload, signature, secret) {
  const expectedSignature = crypto
    .createHmac('sha256', secret)
    .update(payload, 'utf8')
    .digest('hex');
  
  return crypto.timingSafeEqual(
    Buffer.from(signature, 'hex'),
    Buffer.from(expectedSignature, 'hex')
  );
}

// Reject invalid signatures
if (!verifyWebhookSignature(body, signature, webhookSecret)) {
  return res.status(401).send('Invalid signature');
}