onExecutePostUserRegistration.js

/**
* Handler that will be called during the execution of a PostUserRegistration flow.
*
* @param {Event} event - Details about the context and user that has registered.
* @param {PostUserRegistrationAPI} api - Methods and utilities to help change the behavior after a signup.
*/
exports.onExecutePostUserRegistration = async (event, api) => {
   const ManagementClient = require('auth0').ManagementClient;
   const management = new ManagementClient({
      domain: event.secrets.domain,
      clientId: event.secrets.clientId,
      clientSecret: event.secrets.clientSecret,
   });
   var params = { id: event.user.user_id };
   console.log('params >>>> ', params);
   var metadata = {
      address: '123th Node.js Street'
   };
   management.updateUserMetadata(params, metadata, function (err, user) {
      if (err) {
         console.log(err);
      }

      // Updated user.
      console.log('user: ??? ', user);
   });
   
};