curl --request GET \
  --url https://app.tryordinal.com/api/v1/posts/{postId}/subscribers \
  --header 'Authorization: Bearer <token>'

{
  "subscribers": [
    {
      "id": "550e8400-e29b-41d4-a716-446655440300",
      "user": {
        "id": "550e8400-e29b-41d4-a716-446655440011",
        "firstName": "Jane",
        "lastName": "Smith"
      },
      "createdBy": {
        "id": "550e8400-e29b-41d4-a716-446655440010",
        "firstName": "John",
        "lastName": "Doe"
      },
      "createdAt": "2026-01-05T10:30:00.000Z"
    }
  ]
}