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Web hooks are server to server. You can't use web hooks to an app.

• rzzzt 5y ago
  You could use the server on the receiving end of the web hook to send a notification through the platform's push service. Apps can also be reached via server-sent events, a websocket connection or long polling.
• wruza 5y ago
  Well, exact terminology aside one may see web/app push as a webhook, it's the same principle of delivering messages, but with a different addressing scheme. But I disagree with the Android part. Androids are the ones who spam my servers with websockets and other things when I restart them, because a user didn't bother to close a page in their browser. Never seen any iOS device doing that.