hyperobject

const https = require('https'),
      qs = require('querystring'),
      ACCESS_TOKEN = "ACCESS_TOKEN_FROM_SLACK",
      VERIFICATION_TOKEN = "TOKEN_FROM_SLACK";

// Verify Url - https://api.slack.com/events/url_verification
function verify(data, callback) {
    if (data.token === VERIFICATION_TOKEN) {
        callback(null, data.challenge);
    }