Definition
Webhook
A webhook is an automated message one app sends another the moment an event happens, such as a new order, so systems stay in sync in real time.
A webhook is an automated message that one app sends another the moment a specific event happens: a new online order comes in, a payment clears, a reservation is booked. It is the push to an API's pull. Instead of a system constantly asking whether anything new has happened, the source app fires off a notification the instant there is, so everything downstream reacts in real time.
In a restaurant this is the machinery behind integrations that feel instant. A First-party ordering order fires a webhook that prints straight to the Kitchen display system (KDS) and decrements inventory, a booking fires one that triggers the confirmation text, and a completed payment fires one that updates the guest's profile. None of it requires anyone to click refresh.
You will not configure webhooks by hand as an operator, but knowing the concept explains why a well-connected stack updates itself the second something changes, and why choosing tools that support them is worth doing.
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