text: const callback = require('./service/callback.js');
  const contacts = require('./service/contacts.js');
  const jssdk = require('./service/jssdk.js');
  const auth = require('./service/auth.js');
  
  module.exports = app => {
    const services = {
      callback,
      contacts,
      jssdk,
      auth,
    };
    return services;
  };
  