curl --request GET \
  --url https://api.sternrockcapital.com/campaigns/{campaignId}/phone-numbers

{
  "data": [
    {
      "createdAt": "<string>",
      "id": "<string>",
      "phoneNumber": "<string>",
      "provider": "<string>"
    }
  ],
  "pagination": {
    "currentPage": 123,
    "lastPage": 123,
    "perPage": 123
  }
}