Earlier we had a non open source bitrise.io/hooks endpoint for webhooks, but from now on every new project registered should get the new hooks.bitrise.io/h/ webhook URL automatically. We decided to deprecate the old webhook endpoint, as it caused more and more issues when users tried to use newer webhook features (like skip ci or tag based triggering) which are only available with the new version.
We will automatically update all deprecated webhooks on affected Github and Bitbucket repositories if possible. Should your webhook still be a bitrise.io/hooks URL, please replace it with the new one: hooks.bitrise.io/h/ (You can find this on the Code tab of your app!)
Please, check out our DevCenter articles about how to setup a webhook on Github or Bitbucket and how to troubleshoot your webhooks.