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Webhooks can simplify a workflow by notifying one service when a relevant event happens in another, so the next step can begin without someone repeatedly checking for updates or moving information by hand. They are useful when an event should trigger a timely action; for occasional checks, calling an API when needed may be simpler.
What is a webhook?
A webhook is an event-triggered message sent from one service to a configured URL when a subscribed event occurs. The receiving service gets an HTTP request containing event data, validates it, acknowledges the delivery, and then takes an action. GitHub Docs describes webhooks as event subscriptions and contrasts them with polling: repeatedly calling an API to ask whether something has changed.
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Because a webhook sends notice when an event occurs, it can reduce repeated checks and provide near-real-time updates. That does not make it the right choice for every task. If you are checking a small number of resources only occasionally, making an API call when needed may be simpler. The sources establish a workflow advantage, not a guaranteed number of hours saved or a measurable productivity increase.
How can webhooks automate a workflow?
A webhook connects an event in a sending service to an action in a receiving service. For example, a repository push can trigger a deployment or start continuous integration; a new team member can prompt project setup; a pull-request review can generate a collaboration notification; or an event can update an issue tracker or an audit log. GitHub’s examples show how the event and follow-on action depend on what each service supports.
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- Choose the event that should start the workflow in the sending service.
- Configure the destination URL that will receive the HTTP request.
- Have the receiving service verify the delivery and inspect its event details.
- Acknowledge the request, then perform the action directly or send longer work to a background queue.
A workflow automation platform can provide the receiving or sending step without requiring you to build every connection yourself. Zapier documents both sending requests to external URLs and starting workflows from incoming webhooks in its Webhooks by Zapier guide. The key is to confirm that the source exposes the trigger you need and the destination can perform the intended action.
Should you use a no-code workflow or build a receiver?
Neither approach is automatically faster or more flexible in every situation. Decide based on the integration, the controls you need, and who will operate it.
| Decision factor | No-code workflow | Custom receiver |
|---|---|---|
| Setup | Can connect supported triggers and actions through a workflow platform. Zapier recommends familiarity with HTTP requests, APIs, and API documentation for its send-webhooks feature. | Requires an endpoint and familiarity with HTTP and the APIs involved. |
| Security | Check which delivery verification and credential protections the platform and connected services provide. | You control how the endpoint verifies the provider’s signature or secret, uses HTTPS, limits events, and protects credentials. |
| Reliability operations | Review the platform’s delivery limits, delays, retry behavior, queues, replay options, and failure visibility. | You are responsible for prompt acknowledgements, processing, monitoring, and recovery or redelivery. |
| Availability and cost | Plan availability can change. Zapier’s send-webhooks page, updated August 10, 2026, lists the described capability for Professional, Team, and Enterprise plans; check its current plan details before choosing. | Requirements and operating costs depend on the receiver you build and run. |
Zapier’s send-webhooks guide covers the platform’s outbound request option and its stated prerequisites. A custom receiver may suit a team that needs direct control over validation and processing, provided it can operate the endpoint reliably. In either case, verify that the tools support the event and action the workflow requires.
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How do you secure webhook deliveries?
Treat every incoming request as untrusted until you have verified it. For GitHub webhooks, GitHub’s security guidance recommends a random, high-entropy secret, secure storage of that secret, HTTPS with SSL certificate verification enabled, and keeping API keys or other credentials out of the payload URL.
- Subscribe only to the events your workflow needs.
- Verify the delivery using the sending provider’s documented signature or secret procedure. Header names and verification methods differ by provider.
- Check the event type and action before triggering a consequential step.
- For GitHub, use the
X-GitHub-Deliveryidentifier to help detect replayed deliveries. A requested redelivery retains the original identifier. - If you use GitHub IP allow-listing, keep the list updated because GitHub’s IP ranges can change.
Do not assume another provider uses GitHub’s secret, headers, identifiers, or IP ranges. Follow that provider’s current delivery-verification instructions.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How do you avoid missed or delayed events?
Webhook reliability depends on the sending provider’s acknowledgement deadline, retry rules, throttling, and recovery options. For GitHub, the documented requirement is a prompt success response: “Your server should respond with a 2XX response within 10 seconds of receiving a webhook delivery.” That is a GitHub-specific delivery limit, not a universal webhook standard. A receiver that needs longer can acknowledge first and process the event asynchronously using a queue.
If your GitHub receiver is unavailable, GitHub recommends redelivering missed deliveries after the server returns. Keep track of deliveries and failures so you can identify work that needs recovery rather than assuming every event was processed.
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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchZapier’s behavior is different and subject to change. Its rate-limits page, updated May 29, 2026, lists thresholds of 20,000 requests every five minutes per user and 1,000 requests every five minutes per Zap for legacy webhook routes. The page also describes throttling, possible delays during high activity, exponential-backoff guidance, replay, and a queue-delay option. Check Zapier’s current rate-limit guidance before relying on these limits; they should not be generalized to other providers.
Quick Recap
What to check before putting a webhook workflow into use
- Confirm the source event and destination action are supported.
- Choose only the events the workflow needs, and validate both event type and action.
- Use HTTPS and the provider’s delivery-authentication method; keep secrets and API credentials out of the URL.
- Know the provider’s acknowledgement deadline, throttling thresholds, retries, and replay or redelivery options.
- Plan for temporary receiver outages, including how queued work is processed and missed deliveries are recovered.
- Review plan availability and operational limits directly with the platform, since these details can change.
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