code: public SetVolumeForUsersPlaybackRequest.Builder setVolumeForUsersPlayback(int volume_percent) {
      return new SetVolumeForUsersPlaybackRequest.Builder(accessToken)
              .setDefaults(httpManager, scheme, host, port)
              .volume_percent(volume_percent);
    }
docs: Set the volume for the users current playback device.
  
  @param volume_percent Integer. The volume to set. Must be a value from 0 to 100 inclusive.
  @return A {@link SetVolumeForUsersPlaybackRequest.Builder}.