text: module.exports = (req, res) => {
      const hubChallenge = req.query["hub.challenge"];
      const hubMode = req.query["hub.mode"];
      const verifyTokenMatches = (req.query["hub.verify_token"] === "<YOUR VERIFICATION TOKEN>");
  
      if (hubMode && verifyTokenMatches) {
          res.status(200).send(hubChallenge);
      } else {
          res.status(403).end();
      }
  };