curl -X POST https://api.mailofly.com/api/v1/topics \
  -H "Authorization: Bearer mf_live_your_api_key" \
  -H "Content-Type: application/json" \
  -d '{
    "name": "Product Updates",
    "description": "Weekly digests on new features and product improvements",
    "defaultStatus": "opt_in"
  }'

{
  "data": {
    "id": "top_123",
    "name": "Product Updates",
    "description": "Weekly digests on new features and product improvements",
    "defaultStatus": "opt_in",
    "createdAt": "2026-09-11T13:40:00Z"
  }
}