Webhook event for repository creation / deletion


I created an integration and I selected the “Repository” event to get creation and deletion webhooks…but I don’t get them. Plus, I don’t know if it is linked, but I get the “integration_installation_repositories” event 3 or 4 times (same X-Hub_signature each of those 3/4 times).
What am I supposed to do to be notified upon repository deletion (not only installation removal for this repository) ?