Your token is stored only in this browser (localStorage) and sent on each request to your
relay URL above, which forwards it to Notion and nothing else. Make sure your database is
shared with your integration, and that the Worker from worker.js is deployed on Cloudflare.
"Done" property: pick a checkbox (e.g. "Completed") if you have one — simplest option.
If you only have a multi-stage Status field, pick that instead and I'll ask which stage counts as finished.