code: func (c *Manager) GetLibraryItem(ctx context.Context, id string) (*Item, error) {
  	url := internal.URL(c, internal.LibraryItemPath).WithID(id)
  	var res Item
  	return &res, c.Do(ctx, url.Request(http.MethodGet), &res)
  }
docs: // GetLibraryItem returns information on a library item for the given ID.