A node worker for firebase to add a user to mailchimp

mailchimp-firebase.js

var mcapi = require('./node_modules/mailchimp-api/mailchimp');

var usersRef = db.ref('users');
var mc = new mcapi.Mailchimp('xxxxxxxxxx-api-key-us4');
usersRef.orderByChild('added_to_mailchimp').equalTo(null).on('child_added',function(snapshot){
  var user = snapshot.val();
  var key = snapshot.key;
  if(user && user.email){
    var listId = 'xxxx-list-id-xxxx';
    var name = user.displayName || '';
    var fname = name.split(' ')[0];
    var lname = name.split(' ').slice(1).join(' ');
    mc.lists.subscribe({id: listId,
                       email:{email:user.email},
                       merge_vars: {
                         name: name,
                         LNAME: lname,
                         FNAME: fname
                       },
                       double_optin: false,
                       update_existing: true,
                       send_welcome: false
    }, function(data) {
      db.ref('users/'+ key +'/added_to_mailchimp').set(true);
    },
    function(error) {
    });
  }
});