code: public CreatePlaylistRequest.Builder createPlaylist(String user_id, String name) {
      return new CreatePlaylistRequest.Builder(accessToken)
              .setDefaults(httpManager, scheme, host, port)
              .user_id(user_id)
              .name(name);
    }
docs: Create a playlist.
  
  @param user_id The playlists owner.
  @param name    The name of the playlist.
  @return A {@link CreatePlaylistRequest.Builder}.
  @see <a href="https://developer.spotify.com/web-api/user-guide/#spotify-uris-and-ids">Spotify: URLs &amp; IDs</a>