How a webhook works: stop polling, get called

How a webhook works: stop polling, get called

Polling sent 286 requests. A webhook sent one.

Asking every 10 seconds whether a payment cleared, 285 answers said nothing new, and the app still found out 6 seconds late. With a webhook, the app hands over its URL once and the service calls it the moment it happens.

Send this to whoever is still polling.

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