curl --request GET \
  --url https://api.hubapi.com/blogs/v3/blog-authors/{author_id}

{
  "id": 123,
  "portal_id": 123,
  "full_name": "<string>",
  "email": "jsmith@example.com",
  "username": "<string>",
  "user_id": 123,
  "slug": "<string>",
  "bio": "<string>",
  "avatar": "<string>",
  "gravatar_url": "<string>",
  "website": "<string>",
  "twitter": "<string>",
  "linkedin": "<string>",
  "facebook": "<string>",
  "google_plus": "<string>",
  "created": 123,
  "updated": 123,
  "deleted_at": 123
}