How to Read History in Trigger Script.

Hi,

I execute following CLI in script, which gives me response.

var command = new Packages.com.mks.api.Command("im", "viewissue");

   command.addOption(new Packages.com.mks.api.Option("showHistory"));

   ProjectID = 30300;

   command.addSelection(ProjectID);

   var response = api.executeCmd(command);

   if(response != null)

   {

     var status = response.getWorkItems().next();

     //want history here

   }

I don't know how to read History through it, here I want what modification was done on the project 30300 in last few days. 

Is there any method in API Bean instead of CLI ?