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These hooks executed in order, by assumption users and profiles are separated.

(after)Create User-->(before)Create Profiles

After Create User Hook create-profile.js

module.exports = function (options = {}) {
  return async context => {
    async function patchProfile (userId, data) {
      return await context.service.patch(userId, data);
    }
    const userId = context.result._id,
      email = context.result.email,
      profiles = context.app.service('profiles'),
      data = { userId: userId },
      params = { email: email };
      
    await profiles.create(data,params).then((result) => {
          const data = { profileId: result._id };
          patchProfile(userId, data);
      });
      
    return context;
  };
};

Before creating profile hook gravatar-url.js This hook require crypto for hashing npm i --save crypto

const crypto = require('crypto'),
  gravatarUrl = 'https://s.gravatar.com/avatar',
  query = 's=64';

// eslint-disable-next-line no-unused-vars
module.exports = function (options = {}) {
  return async context => {
    const { email } = context.params, 
      hash = crypto.createHash('md5').update(email).digest('hex');
    context.data.avatarUrl = `${gravatarUrl}/${hash}?${query}`;
    
    return context;
  };
};