Observed Signal · May 10, 2026 · Technical Walkthrough · Source: DEV Community · Impact: 2/5 · Sentiment: Positive
Ingest Webhooks From Any Provider Using Centrali
This technical walkthrough demonstrates how to use Centrali to ingest and permanently store webhook events from any provider that sends HTTP POST requests, using GitHub as the example. It shows creating a serverless function (Store GitHub Event) that flattens key fields and writes the raw payload into a schemaless collection named 'github-events', and configuring an HTTP trigger with per-trigger signature verification. The guide details GitHub's HMAC-SHA256 signature format (x-hub-signature-256), the extraction regex (sha256=(.+)), and how to configure signature validation in Centrali. The same function + trigger pattern and signature settings can be applied to other providers (Stripe, Shopify, Twilio). It also shows querying stored events programmatically via the Centrali SDK.
Practical developer guide for building webhook ingestion and event storage pipelines; useful for engineers capturing real-time event data and implementing per-provider signature verification, but not industry-shifting.
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Key Takeaways & Evidence Grounding
- Centrali can store webhook events from any provider that sends HTTP POST requests.
- Signature verification is configurable per trigger; the GitHub example uses the x-hub-signature-256 header with HMAC-SHA256 and extraction regex sha256=(.+).
- The walkthrough creates a function called 'Store GitHub Event' that flattens fields (eventType, sender, repo, action) and stores the full payload in a schemaless collection named 'github-events'.
- An HTTP trigger named 'github-webhook' with path 'github' exposes a public webhook URL at https://api.centrali.io/data/workspace/{your-workspace}/api/v1/http-trigger/github.
- Centrali provides an SDK (CentraliSDK) to query stored records programmatically (examples include filtering by eventType, repo, and sender).
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Verify Webhooks Using HMAC Signatures
This technical how-to explains how to secure webhook endpoints by verifying incoming requests with HMAC signatures. It describes the shared-secret HMAC-SHA256 flow used by providers (e.g., GitHub, Stripe, Slack), shows example signature header formats, and provides concrete implementation samples in Node.js (Express) and Python (FastAPI). The guide stresses verifying raw request bytes, using timing-safe comparisons to avoid timing attacks, and validating timestamps to prevent replay attacks. It also highlights common mistakes (parsing before verification, hardcoding secrets) and recommends storing secrets in environment variables and rotating them if needed.
Guide: Test Webhook Integrations Locally
This developer guide describes a practical workflow for testing webhook integrations locally. It recommends exposing a real public HTTPS endpoint that preserves request history and shows headers, body, query params and timestamps. Start with predictable test events from providers such as Stripe, GitHub, Shopify or Twilio, inspect raw payloads (content type, nested JSON, signature headers) before touching application logic, and record raw input separately from business logic. The guide emphasizes replaying captured requests to iterate faster, deliberately testing failure modes (invalid signatures, stale timestamps, duplicates, large payloads, slow handlers), and using tools like WebhookScout to gain real-time visibility and easy replay. The overall goal is to shorten the debug loop and reduce time spent iterating on webhook integrations.
Validate GitHub Webhooks with HMAC in PHP & Node.js
This technical guide explains how to validate GitHub webhooks using HMAC SHA-256 in PHP and Node.js. It provides minimal-checklist rules (preserve raw body, reject empty secret, validate X-Hub-Signature-256, compute HMAC, perform constant-time comparison) and complete example implementations: PHP using hash_hmac() and hash_equals(), and Node.js using createHmac() and timingSafeEqual(). The article also covers production recommendations such as preserving the raw request body, idempotency via X-GitHub-Delivery, filtering by X-GitHub-Event, limiting body size, queueing heavy work, never logging secrets, and adding business-level authorization checks. A public test vector and a GitHub repository with examples and tests are provided.
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