curl --request DELETE \
  --url https://panel.sendcloud.sc/api/v3/event-subscriptions/connections/{id} \
  --header 'Authorization: Basic <encoded-value>'

{
  "errors": [
    {
      "status": "<string>",
      "code": "unknown_field",
      "detail": "<string>",
      "id": "<string>",
      "links": {
        "about": "<string>"
      },
      "title": "<string>",
      "source": {
        "pointer": "<string>",
        "parameter": "<string>",
        "header": "<string>"
      },
      "meta": {}
    }
  ]
}