code: private void addPostParams(final Request request) {
          if (roomSid != null) {
              request.addPostParam("RoomSid", roomSid);
          }
  
          if (videoLayout != null) {
              request.addPostParam("VideoLayout", Converter.mapToJson(videoLayout));
          }
  
          if (audioSources != null) {
              for (String prop : audioSources) {
                  request.addPostParam("AudioSources", prop);
              }
          }
  
          if (audioSourcesExcluded != null) {
              for (String prop : audioSourcesExcluded) {
                  request.addPostParam("AudioSourcesExcluded", prop);
              }
          }
  
          if (resolution != null) {
              request.addPostParam("Resolution", resolution);
          }
  
          if (format != null) {
              request.addPostParam("Format", format.toString());
          }
  
          if (statusCallback != null) {
              request.addPostParam("StatusCallback", statusCallback.toString());
          }
  
          if (statusCallbackMethod != null) {
              request.addPostParam("StatusCallbackMethod", statusCallbackMethod.toString());
          }
  
          if (trim != null) {
              request.addPostParam("Trim", trim.toString());
          }
      }
docs: Add the requested post parameters to the Request.
  
  @param request Request to add post params to