What is a webhook?
A webhook is an automatic HTTP message that one system sends to another system’s URL the moment an event happens, such as a payment, a new order or a form submission. The receiver does not have to keep asking for news; the webhook arrives on its own.
Also called: HTTP callback
Why it matters
Webhooks make integrations fast and light: your systems react within seconds instead of checking every few minutes. They are also how payment services confirm a payment, so a missed webhook can leave a paid order unshipped. You need logging, retries and a signature check on every webhook you accept.
1Webhook vs APIWith an API you ask for data; with a webhook the other system tells you when something changes.
2Webhook URLThe receiving system publishes an endpoint URL, and the sender posts the event data there, usually as JSON.
3SecurityCheck the signature on each webhook and handle duplicates, because senders retry when you do not answer.
ExampleA yoga studio in Almaty takes card payments on its website. When a payment succeeds, the payment service sends a webhook to the studio’s booking system, which confirms the place and messages the client on WhatsApp. A webhook from the WhatsApp Business API also passes each new customer message to the CRM.
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Related terms
APIA defined way for one piece of software to request data or actions from another.REST APIA style of web API where data lives at URLs and is read or changed with standard HTTP methods.Workflow automationSoftware that moves work between people and systems by set rules, without manual copying or chasing.Payment gatewayThe service that takes a card payment at checkout and passes it on securely to the bank for approval.
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