curl --request GET \
  --url https://api.thehaystack.ai/v2/haystack/collections/{collectionId} \
  --header 'Authorization: Bearer <token>'

{
  "collection": {
    "id": 1,
    "name": "Sunday Sermons",
    "fullService": false,
    "variantTypes": [
      {
        "id": 123,
        "name": "Sermon Video",
        "indexable": true,
        "displayOrder": 123,
        "collectionId": 123
      }
    ]
  }
}