function cancel()
 {
     if (!$this->id) {
         return;
     }
     $api = new WPLA_AmazonAPI($this->account_id);
     $result = $api->cancelFeedSubmission($this->FeedSubmissionId);
     // echo "<pre>";print_r($result);echo"</pre>";die();
     if ($result->success) {
         // update feed status
         // $this->FeedSubmissionId     = $result->FeedSubmissionId;
         // $this->FeedProcessingStatus = $result->FeedProcessingStatus;
         // $this->SubmittedDate        = $result->SubmittedDate;
         // $this->status 		    	= 'cancelled';
         // $this->update();
     }
     // success
     return $result;
 }