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Atlas · Foundations webhook

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Webhook

An event notification sent as an HTTP request to an endpoint you configure, so your application can react without repeatedly polling.

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    Beginner field notes

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    • A webhook sends an event notification to an HTTP address you configure, so your app can react without constantly asking whether something changed.
    • Receiving the notification and finishing your own work are separate steps. A webhook arriving does not mean every downstream action is complete.
    • Stripe sends webhook event requests to your endpoint. Check each provider’s method, payload and acknowledgement rules before writing a handler.
    See a worked example

    Follow one event notification to a receiver

    One reviewed sample, shared across levels. Nothing here runs on your computer.

    Example review recorded 2026-10-20 · version 1.

    Example input · do not paste
    Illustrative GitHub-style delivery; only selected fields are shown.
Subscribed event: issues
Header: X-GitHub-Event: issues
Body excerpt: {"action":"opened","issue":{"number":7,"title":"Fix a typo"}}
Assume signature validation of the original request bytes has already succeeded.
Receiver rule: for issues + opened, queue a notification naming that issue.
    Example output · do not paste
    Chosen branch: issues + opened.
Queued notification: Issue #7 — Fix a typo.
Illustrative receipt acknowledgement: HTTP 202 Accepted.
The acknowledgement does not say the queued work has finished.

    The event causes the sender to push an HTTP request to the configured receiver URL. The receiver uses the event header and payload action to select the rule, then acknowledges receipt. This case starts after signature validation; a real receiver must validate a delivery before processing it further. The partial payload and predicted queue entry are synthetic, not a full signed request or an executed server. One delivery is considered here; this does not establish duplicate handling or exactly-once processing.

    Sources for this sample

    Visual

    An event source delivers a notification to a configured endpoint. The receiver verifies and acknowledges according to the provider’s contract, continues application work, and handles repeated delivery without assuming a universal timeout or arrival order.

    The reviewed description and complete diagram source are available here.

    Read the complete diagram source

    This is the source for the reviewed diagram, not a command to run.

    sequenceDiagram
  participant S as Event source
  participant R as Your endpoint
  participant W as Application work
  Note over S,R: Endpoint is configured in advance
  S->>R: Deliver event notification
  Note over R: Verify and accept using provider contract
  R-->>S: Prompt acknowledgement
  R->>W: Continue accepted work
  S->>R: Possible repeated delivery
  Note over R: Avoid repeating the same effect
    Primary sources

    Source collection

    • Stripe: Webhook delivery and signature contract

      Used in: Quick notes · Lesson text

      Provider-specific notification, duplicate/order behavior, raw-body signatures, endpoint secrets, replay timestamps and prompt acknowledgement; not universal guarantees for other providers.

    • GitHub Docs: Handling webhook deliveries

      Used in: Worked example

      Subscribed events cause HTTP deliveries to the configured URL; handlers inspect event/action data, and a 2xx response acknowledges receipt. The official example uses 202.

    • GitHub Docs: Validating webhook deliveries

      Used in: Worked example

      Webhook signatures should be validated before further processing, using the secret and original payload bytes; an event header alone does not authenticate the sender.

    Notes AI source review · 2026-10-17

    The summary, key points and diagram were independently compared with primary documentation using AI on 2026-10-07. The approval is bound to this written content. It does not approve a video or timestamp window. Human learner validation is pending.

    Quick quiz · one question

    Who sends the notification?

    Sample scenario. Fictional contract: this event triggers Archive to POST its event notification to Board's configured endpoint. No request runs here. Authenticity is given; later business work is not supplied.

    Event in the source app
    Archive: evt-label-changed, type label.changed. Authenticity is supplied, not verified.
    Declared subscription
    Board subscribes at POST https://board.example/hooks/label-events. This is this provider's fictional contract.
    Downstream work
    No downstream completion is supplied. No request or signature check runs.

    Archive records label.changed. How does the configured webhook tell Board about that event?

    Answers stay on this device.

    Sources and exercise scope
    • Stripe Docs: Receive Stripe events in your webhook endpoint

      Existing approved lesson describes an event source notifying a configured HTTP endpoint, possible repeated/delayed delivery and notification distinct from completed business work. POST, app names and route here are explicitly supplied fictional contract facts.

    Original synthetic exercise. AI comparison against the reviewed lesson recorded on 2026-10-20; the references above state their scope. Human learner validation has not been run. A result here records this attempt; it does not establish mastery.

    Follow this learning pathLesson 6 of 8

    From a web request to safe event handling

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