I recently updated the custom domain on my account. What I didn't realize is that this would also update the URL to my webhook for the JIRA integration, and ultimately cause the JIRA -> Aha! push to stop working. To avoid this in the future, I would recommend keeping the webhook URL the same even if the custom domain changes.
Alternatively, you could just ensure the previous webhook URL continues to work, while providing an updated one as well. Or at the very least, an alert would be helpful when changing the custom domain to notify that you must then update your webhook as well.
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