curl --request GET \
  --url https://api.headlesscommerce.io/v1/admin/collections \
  --header 'Authorization: Bearer <token>'

{
  "data": [
    {
      "id": "<string>",
      "name": "<string>",
      "slug": "<string>",
      "description": "<string>",
      "position": 123,
      "metadata": {},
      "created_at": "2023-11-07T05:31:56Z"
    }
  ],
  "total_count": 123,
  "has_more": true,
  "next_cursor": "<string>"
}