curl -X POST https://api2.ecomailapp.cz/tracker/events \
  -H "key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "event": {
      "email": "foo@bar.cz",
      "category": "category",
      "action": "action",
      "label": "label",
      "property": "property",
      "value": "value"
    }
  }'

{
  "id": 1234,
  "email": "foo@bar.cz",
  "category": "category",
  "action": "action",
  "label": "label",
  "property": "property",
  "value": "value"
}