Webhooks

{
  "event": "payment.completed",
  "payment_intent_id": "pi_xxxx",
  "merchant_id": "a1b2c3d4-...",
  "amount": 29.99,
  "currency": "USD",
  "status": "completed",
  "completed_at": "2025-01-01T12:31:55Z",
  "reference": "ORDER-1042",
  "metadata": { "table": "5", "cashier": "Maria" }
}

import hmac, hashlib

def verify_webhook(body: bytes, signature: str, secret: str) -> bool:
    expected = hmac.new(
        secret.encode(),
        body,
        hashlib.sha256
    ).hexdigest()
    return hmac.compare_digest(expected, signature)

const crypto = require('crypto');

function verifyWebhook(body, signature, secret) {
  const expected = crypto
    .createHmac('sha256', secret)
    .update(body)
    .digest('hex');
  return crypto.timingSafeEqual(
    Buffer.from(expected),
    Buffer.from(signature)
  );
}