curl -X GET https://api.mailofly.com/topics \
  -H "Authorization: Bearer mf_live_your_api_key"

{
  "data": [
    {
      "id": "top_123",
      "name": "Product Updates",
      "description": "Weekly digests on new features and product improvements",
      "defaultStatus": "opt_in"
    },
    {
      "id": "top_456",
      "name": "Promotions",
      "description": "Exclusive discounts and seasonal sales",
      "defaultStatus": "opt_out"
    }
  ]
}