We have a class that handles lead inserts from a 3rd party source. Within the class, we have created an inner class called LeadDetailResponseData which handles the lead insert responses.

global class LeadDetailResponseData {
    public Integer MessageId;
    public String Status;
    public String ErrorMessage;
  }

We have then created a list of 'LeadDetailResponseData' types that will store the results of the lead import:

List<LeadDetailResponseData> ResponseMsg = new List<LeadDetailResponseData>();

Upon insertion, if there are any errors, it is getting stored to the ErrorMessage variable. The message then gets added to the list of Lead Detail Responses. Note that l is an instance of a Lead object and lr is an instance of the LeadResponseDetail class.

   try {
            l.setOptions(dmo);
            insert l;
          } catch (DmlException e) {
            lr.Status = '-1'; //Insert Error
            lr.ErrorMessage = e.getMessage();
          }  

   ResponseMsg.Add(lr);
   return ResponseMsg;

My question is where does the Return go? Is it returned to the process that's calling this class? Or is it stored somewhere within the instance of Salesforce.

Any feedback is much appreciated.

Thanks.