Hi @이진규 ,
While you can't customize the payload from the webhook integration, you can add custom fields to alerts via the integrations that created them by using the "extra properties" fields.
For example, if using an API integration to create an alert, you could add an extra property called "custom key" and set the value to the alert's priority.
Then, when alerts created by the API integration are sent by the webhook, the extra properties will be included as children of the "details" key.
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