code: function listProjectSubmissions(req, res, next) {
    var formId = req.body.formId;
    var subIds = req.body.subid;
  
    var params = {
      wantRestrictions: false,
      appId: req.params.projectid
    };
  
    //Assigning Form Search If Set
    if (_.isString(formId)) {
      params.formId = formId;
    }
  
    //Assigning Submission Search Params If Set
    if (_.isArray(subIds)) {
      params.subid = subIds;
    } else if (_.isString(subIds)) {
      params.subid = [subIds];
    }
  
    logger.debug("Middleware listProjectSubmissions ", {params: params});
  
    forms.getSubmissions(req.connectionOptions, params, submissionsHandler(constants.resultTypes.submissions, req, next));
  }
docs: Search Submissions That Belong To The Project.
  @param req
  @param res
  @param next