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SSRF Protection for Webhook Senders: Check at Registration and at Send Time
How webhook senders prevent SSRF: validate customer URLs at registration, then resolve, check and pin the IP before each send. Node.js code included.
Shopify Webhooks: HMAC Verification, 5-Second Timeout, Retries
Shopify webhooks checked against the docs: base64 HMAC with the client secret, 5-second timeout, 8 retries over 4 hours, subscription removal, and Node.js code.
Handling Duplicate Webhooks: Idempotency with Event IDs
Why webhooks arrive twice, three ways to make receivers idempotent, handling concurrent duplicates, and where Stripe, GitHub, Shopify and others put the event ID.
Monitoring Outgoing Webhooks: Failure Rates, Backlogs, and Alerts
What to measure when you send webhooks - time failing per endpoint, retry backlog, latency - when to alert, whom to tell, and how to warn before auto-disabling.
Webhook Response Status Codes: What to Return and What Senders Do
Which status code a webhook receiver should return, and how Stripe, Shopify, GitHub, Slack, LINE and Standard Webhooks treat non-2xx, redirects, 410 and 429.
Stripe Webhooks: Retries, Ordering, Duplicates, Timeouts, and IPs
Stripe webhook retries, ordering, duplicates, timeouts and source IPs in one table, each linked to Stripe's docs, plus how to build a receiver around them.
How to Test Webhooks Locally: Tunnels, Provider CLIs, and Replays
Three ways to receive webhooks on localhost (ngrok or cloudflared tunnels, provider CLIs like stripe listen, replayed payloads) and when to use each.
How to Send Webhooks: Every Part You Have to Build
Sending a webhook is one POST. Sending them reliably takes eleven parts, from URL checks and signing to retries, logs, alerts, auto-disabling and a customer portal.
Why Webhook Signature Verification Fails: Raw Body, Wrong Secret, Clock Skew, Proxies
Why webhook signature checks fail (raw body, wrong secret, hex vs base64, clock skew, proxies), how to debug it, and what Stripe, Shopify, GitHub and others sign.
Centralizing Webhooks Across Products: Why and How
Why teams that send webhooks from several products should run signing, retries, delivery logs and failure alerts in one place, and how to migrate.
Webhook Delivery Services Compared: Svix, Hookdeck Outpost, Convoy, Hook0, DIY and Webhook Admin
Svix, Hookdeck Outpost, Convoy, Hook0, DIY and Webhook Admin compared on price, free tier, static IPs and self-hosting, checked on 2026-09-27.
Webhook Retries: Exponential Backoff, Jitter, Idempotency and Auto-Disabling
How to design webhook retries: exponential backoff with jitter, webhook-id deduplication, timeouts and auto-disabling, with Stripe, Shopify, GitHub and Svix policies.
Sending Webhooks from a Static IP: NAT Gateways, Proxies and Relays
Send webhooks from fixed IPs for customers with allowlists: NAT gateway, proxy and relay setups, their costs, SSRF checks, and why to keep signatures.