- (void)loadAndOpenDocument:(NSDictionary *)documentData {
    if(![[documentData objectForKey:@"attachment"] length]) {
        return;
    }

    [MBProgressHUD showHUDAddedTo:self.view animated:YES];
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0),
                   ^{
                       // Async part
                       NSDictionary *answer = [[WebService sharedManager] call:@"getInvoice" arguments:@[[documentData objectForKey:@"attachment"]]];

                       dispatch_async(dispatch_get_main_queue(),
                                      ^{
                                          // Sync part (in main thread)
                                          [MBProgressHUD hideHUDForView:self.view animated:YES];

                                          if([[AnswerHandler sharedManager] processAnswer:answer]) {
                                              NSArray*pdfData = [answer valueForKeyPath:@"data.pdf"];

                                              NSMutableData *data = [[NSMutableData alloc] initWithCapacity:pdfData.count];
                                              for (NSNumber *byteVal in pdfData) {
                                                  Byte b = (Byte)(byteVal.intValue);
                                                  [data appendBytes:&b length:1];
                                              }

                                              if (pdfData) {

                                                  NSArray *paths=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
                                                  NSString *documentDirectory=[paths objectAtIndex:0];

                                                  NSString*textToSet = [documentData objectForKey:@"attachment"]; // ????

                                                  NSString * imgFileName = @"invoice.pdf";

                                                  NSString *finalPath=[documentDirectory stringByAppendingPathComponent:[NSString stringWithFormat:imgFileName,textToSet]];

                                                  NSLog(@"finalpath--%@",finalPath);
                                                  if(pdfData)
                                                      [data writeToFile:finalPath atomically:YES];

                                                  DisplayInvoiceViewController *detailViewController = [[DisplayInvoiceViewController alloc] initWithNibName:@"DisplayInvoiceViewController" bundle:[NSBundle mainBundle]];
                                                  detailViewController.pdfPath = finalPath;
                                                  [self.navigationController pushViewController:detailViewController animated:YES];
                                              }
                                          }
                                      });
                   });
}