Pre User Registration hook for Auth0 that block disposable emails

preuserhook.js

const emailVerifier = require("verifier-node");
module.exports = function (user, context, cb) {
  var response = {};

  emailVerifier.verify(user.email,  context.webtask.secrets.VERIFIER_APIKEY)
  .then(response => {
    
    if (!response.valid()) return cb(new Error('Disposable email!'));

    response.user = user;    
    cb(null, response);
  });
  
};

Hi, have you a readme on this code? Im looking to get the Verifier_apikey working.

Thank you

Karl