function printPDF(params) {
    var renderer = render.create();
    renderer.setTemplateByScriptId({
       scriptId: 'CUSTTMPL_SALE'
    });
    var lookupResult = search.lookupFields({type: search.Type.VENDOR, id: params.vendor_id, columns: ['altname']});
    renderer.addCustomDataSource({
       format: render.DataSource.OBJECT,
       alias: 'data',
       data: {
          vendor_id: params.vendor_name,
          vendor_name: lookupResult.altname
       }
    });

    renderer.addRecord({
       templateName: 'record',
       record: record.load({
          type: params.record_type,
          id: parseInt(params.record_id)
       })
    });

    return renderer.renderAsString();
}

var fileObj = printPDF(params);
response.setHeader({
    name: 'Content-disposition',
    value: 'filename="' + params.tran_id + '"'
});
var pdfFile = render.xmlToPdf({
    xmlString: fileObj
});

response.writeFile({file: pdfFile});

serverResponse.write({

output: renderer.renderAsString()

});