Simple Lambda Node script for passing new Stripe customer to Mailchimp list

stripe_to_mailchimp_lambda.js

/**
 * Stripe to Mailchimp passthrough 
 * 
 * 1. Setup a Lambda in AWS (128mb) with an API endpoint and paste in this script.
 * 2. Add a map to the API for type application/json
 * // we need this to add some BASIC security
 * {
 *   "secret" : "$input.params('secret')",
 *    "body" : $input.json('$')
 * }
 * 3. Add a webhook to Stripe with the API endpoint and add ?secret=SOMETHING_RANDOM to the end.
 * 4. Get an API Key from Mailchimp
 * 5. The Mailchimp API prefix is at the end of the API Key (ex. us5, us6, etc.)
 * 6. Get the Mailchimp list id
 * 7. Send a test event for customer.created from Stripe
**/

var https = require('https');

exports.handler = function(event, context) {
  
  if (event.body.type != "customer.created") context.fail("Invalid Request");
  if (event.secret != 'YOUR_KEY_HERE') context.fail("Unauthorized");
  
  var list_id = 'MAILCHIMP_LIST_ID_HERE'; // mailchimp list id

  var data = {
    "email_address": event.body.data.object.email,
    "status": "subscribed"
  };

  data = new Buffer(JSON.stringify(data), 'utf8');

  var options = {
    'auth': 'apikey:MAILCHIMP_API_KEY_HERE',
    'headers': {
        'Content-Type':'application/json',
        'User-Agent': 'MailChimp-Node/3.0.0',
        'Content-Length': data.length
    },
    'method': 'POST',
    'hostname': 'MAILCHIMP_API_PREFIX_HERE.api.mailchimp.com',
    'path': '/3.0/lists/'+list_id+'/members'
  };

  var req = https.request(options, function(res) {
      var body = '';

      res.setEncoding('utf8');

      res.on('data', function(chunk) {
          body += chunk;
      });

      res.on('end', function() {
          context.succeed(body);
      });
  });

  req.on('error', context.fail);
  req.write(data);
  req.end();
};