{
  "_comment": "Mailchimp → Audience → Settings → Webhooks → Create new webhook, or the body of POST https://<dc>.api.mailchimp.com/3.0/lists/<audience id>/webhooks. Callback URL: your relay's HTTPS URL followed by /<RELAY_SECRET>. Only the subscribe event is needed; the relay ignores the others.",
  "url": "https://<your-relay-host>/<the same long random string as the relay's RELAY_SECRET>",
  "events": {
    "subscribe": true,
    "unsubscribe": false,
    "profile": false,
    "cleaned": false,
    "upemail": false,
    "campaign": false
  },
  "sources": {
    "user": true,
    "admin": true,
    "api": true
  }
}