Complete Guide to Enterprise API Integrations, Webhooks & Security

1. Building Resilient Webhook Ingestion Pipelines

Webhooks are inherently unpredictable. Third-party providers may send duplicate events, out-of-order payloads, or burst spikes during peak events.

• Always process webhooks asynchronously using message queues (e.g., BullMQ, RabbitMQ).
• Store raw webhook payloads for audit logging and retry capability.
• Implement idempotent processing keys to prevent duplicate event execution.

import crypto from "crypto";
import { Request, Response, NextFunction } from "express";

export function verifyWebhookSignature(secret: string) {
  return (req: Request, res: Response, next: NextFunction) => {
    const signature = req.headers["x-signature-sha256"] as string;
    const computedHash = crypto
      .createHmac("sha256", secret)
      .update(JSON.stringify(req.body))
      .digest("hex");

    if (signature !== `sha256=${computedHash}`) {
      return res.status(401).json({ error: "Invalid HMAC signature" });
    }
    next();
  };
}

2. API Security, Rate Limiting & Auth Protocols

Protecting public API endpoints against denial-of-service (DoS) attacks and data extraction requires strict rate limiting and token rotation.