What is a webhook?

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How a webhook works
From event to action in a few simple steps
Event: Something happens in an app, like a new order, form fill, or payment.
Send: The app sends an HTTP POST request to a specific webhook URL.
Payload: The request carries data about the event, often in JSON format.
Verify: Your system checks the secret or signature before trusting the message.
Act: Your software updates a record, alerts someone, or starts a workflow.
The receiving system still decides what to do with the webhook data.

What's inside a webhook?
The message usually includes event details, data, and trust signals
Event type: Tells you what happened, such as order.created or form.submitted.
Payload: The actual event data, like customer info, totals, IDs, or status values.
Timestamp: Shows when the event occurred so systems can process it in context.
Signature: Helps confirm the message really came from the expected sender.
Response: Your endpoint returns a status code so the sender knows it was received.
Good webhook design sends useful context without sending unnecessary data.

Webhook vs. polling
Webhooks push data. Polling keeps asking for it.
Webhook
Sends data when something changes
Feels closer to real time
Avoids repeated checking
Works well for event-driven workflows
Polling
Checks on a schedule
May wait until the next check
Can create extra requests
Useful when no webhook exists
Webhook = push. Polling = pull.
Use webhooks for fast event updates; use polling when the other system cannot send them.

Where webhooks help
Common small-business use cases
Leads: A website form instantly creates or updates a CRM contact.
Payments: A paid invoice triggers a receipt, status change, or accounting update.
Orders: A new order alerts operations or starts fulfillment steps.
Scheduling: A booked meeting sends confirmations or reminders automatically.
Support: A new ticket posts to Slack or creates an internal task.
Inventory: A stock change updates another system before someone has to re-enter it.
The best webhook use cases start with a clear trigger and a useful next action.

The small-business takeaway
Webhooks help your software react without manual follow-up
A webhook is a simple way to keep systems in sync when work happens.
Start small: Begin with one event that matters, like a new lead, payment, or order.
Keep it useful: Send only the data needed for the next step.
Keep it trusted: Verify signatures, secure the endpoint, and log what happens.
Plan for failures: Expect retries, timeouts, and occasional bad requests.
Focus on value: Use webhooks where faster response and less manual work help the business.
The value: less copy-and-paste, faster follow-through, and better connected workflows.

Lesson done.

Up next

What is tool calling / function calling?

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The short answer

A webhook is an automatic message one app sends to another the moment something happens, such as a new order, a form submission or a paid invoice, carrying the details of the event. Your other software can then react straight away without anyone re-entering data, as long as you verify the sender and plan for failed deliveries.

Three things to remember

01A webhook pushes data when an event happens, while polling keeps asking on a schedule.
02The message carries the event type, the data, a timestamp and a signature that confirms the sender.
03Send only the data needed, verify signatures, log what happens, and expect retries and failures.

Every slide, in words

01
What is a webhook?
A webhook sends data automatically when something happens
Think of it like a software notification with useful details attached.
Trigger: An event happens, like a new form submission, paid invoice, or order.
Send: The app immediately sends a message to a specific web address.
Act: Your other software receives the data and can update records or start work.
A webhook is event-driven: it pushes information the moment something changes.
02
How a webhook works
From event to action in a few simple steps
Event: Something happens in an app, like a new order, form fill, or payment.
Send: The app sends an HTTP POST request to a specific webhook URL.
Payload: The request carries data about the event, often in JSON format.
Verify: Your system checks the secret or signature before trusting the message.
Act: Your software updates a record, alerts someone, or starts a workflow.
The receiving system still decides what to do with the webhook data.
03
What's inside a webhook?
The message usually includes event details, data, and trust signals
Event type: Tells you what happened, such as order.created or form.submitted.
Payload: The actual event data, like customer info, totals, IDs, or status values.
Timestamp: Shows when the event occurred so systems can process it in context.
Signature: Helps confirm the message really came from the expected sender.
Response: Your endpoint returns a status code so the sender knows it was received.
Good webhook design sends useful context without sending unnecessary data.
04
Webhook vs. polling
Webhooks push data. Polling keeps asking for it.
Webhook
Sends data when something changes
Feels closer to real time
Avoids repeated checking
Works well for event-driven workflows
Polling
Checks on a schedule
May wait until the next check
Can create extra requests
Useful when no webhook exists
Webhook = push. Polling = pull.
Use webhooks for fast event updates; use polling when the other system cannot send them.
05
Where webhooks help
Common small-business use cases
Leads: A website form instantly creates or updates a CRM contact.
Payments: A paid invoice triggers a receipt, status change, or accounting update.
Orders: A new order alerts operations or starts fulfillment steps.
Scheduling: A booked meeting sends confirmations or reminders automatically.
Support: A new ticket posts to Slack or creates an internal task.
Inventory: A stock change updates another system before someone has to re-enter it.
The best webhook use cases start with a clear trigger and a useful next action.
06
The small-business takeaway
Webhooks help your software react without manual follow-up
A webhook is a simple way to keep systems in sync when work happens.
Start small: Begin with one event that matters, like a new lead, payment, or order.
Keep it useful: Send only the data needed for the next step.
Keep it trusted: Verify signatures, secure the endpoint, and log what happens.
Plan for failures: Expect retries, timeouts, and occasional bad requests.
Focus on value: Use webhooks where faster response and less manual work help the business.
The value: less copy-and-paste, faster follow-through, and better connected workflows.

More in part 6

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