curl -X PATCH https://api.mailofly.com/contacts/cnt_123/topics \
  -H "Authorization: Bearer mf_live_your_api_key" \
  -H "Content-Type: application/json" \
  -d '{
    "topics": [
      {
        "topicId": "top_news",
        "status": "unsubscribed"
      }
    ]
  }'

{
  "data": {
    "contactId": "cnt_123",
    "topics": [
      {
        "topicId": "top_news",
        "status": "unsubscribed"
      }
    ]
  }
}