Improvements to Webhook Delivery

We have added an `active` field on the webhook config resource that indicates whether a webhook config will receive events. Webhook configs that have only had failed delivery attempts for more than 7 days will be automatically deactivated. To reactivate a deactivated webhook config, set the `active` field back to `true` via an API request. We've reviewed your current webhook configs, and this should have no effect on your live environment integration.