curl --request GET \
  --url https://api.hubapi.com/conversations/v3/conversations/channels \
  --header 'Authorization: Bearer <token>'

{
  "total": 123,
  "paging": {
    "next": {
      "link": "",
      "after": ""
    }
  },
  "results": [
    {
      "name": "<string>",
      "id": "<string>"
    }
  ]
}