Resend Transactional Email API & Webhooks

{
  "id": "49a3999c-0ce1-4ea6-ab68-afcd6dc2e794",
  "from": "Acme Auth <[email protected]>",
  "to": [
    "[email protected]"
  ],
  "created_at": "2026-03-03T10:00:00.000Z"
}