The simplest way, in my view, would be to use a library to do the parse XML for a Javascript/JSON object.
Could use the fast-xml-parser on Node.JS:
npm install fast-xml-parser
const parser = require('fast-xml-parser');
const jsonObj = parser.parse(response); // "response" é a sua variável
Example using a CDN:
const xmlData =
  '<bookstore><book>' +
  '<title>Everyday Italian</title>' +
  '<author>Giada De Laurentiis</author>' +
  '<year>2005</year>' +
  '</book></bookstore>';
  
const jsonObj = parser.parse(xmlData);
console.log('XML em JSON:', jsonObj);
// Acessando as propriedades deste objeto:
console.log('"title" do xmlData: ', jsonObj.bookstore.book.title);
// simulando seu código
const response =
  '<checkout>' +
  '<code>meucode</code>' +
  '<date>minhadate</date>' +
  '</checkout>';
const responseObj = parser.parse(response);
console.log('dados do "response":', responseObj);
console.log('"code" do responseObj:', responseObj.checkout.code);
<script src="https://cdnjs.cloudflare.com/ajax/libs/fast-xml-parser/3.18.0/parser.min.js"></script>
 
 
							
							
						 
Thanks worked out.
– Bruno Sousa