After the webhooks have been configured, visit https://app.pullrequest.com to verify the status of the on-premise PullRequest Proxy.
This page will need to be refreshed if it was already open. You may need to select the appropriate organization from the drop-down if the desired organization isn't shown by default.
If you're using GitHub Enterprise or GitLab Self-Managed and don't see expected Projects listed in the PullRequest dashboard, you may need to add a public email to your user profile.