curl --request GET \
  --url https://agents.nineteen58.co.za/public-api/campaigns/{id}/get-messages \
  --header 'x-api-key: <api-key>'

{
  "messages": [
    {
      "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "created_at": "2023-11-07T05:31:56Z",
      "earliest_at": "2023-11-07T05:31:56Z",
      "sent_at": "2023-11-07T05:31:56Z",
      "contact": {
        "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
        "name": "<string>",
        "identifier": "<string>"
      },
      "step_name": "<string>"
    }
  ],
  "totalCount": 123,
  "currentPage": 123,
  "pageSize": 123,
  "totalPages": 123
}