Shopify GA Additional Scripts

additionalScripts.js

// Our custom GA additional scripts module
var additionalGA = {
  host: window.location.hostname,
  path: window.location.pathname.split('/'),
  init: function() {
    var isCheckout = this.isCheckout();
    isCheckout ? this.loadSegment() : null;
    //isCheckout ? null : this.ready(this.gaLinker);
  },
  isCheckout: function(){
    // if (this.host === 'checkout.shopify.com') {
    //   return true
    // } else
    if (this.path[1] === '15733025') {
      return true
    } else {
      return false
    }
  },
  ready: function(fn) {
    if (document.readyState != 'loading'){      
      fn();
    } else {
      document.addEventListener('DOMContentLoaded', fn);
    }
  },
  loadSegment: function() {
    !function(){var analytics=window.analytics=window.analytics||[];if(!analytics.initialize)if(analytics.invoked)window.console&&console.error&&console.error("Segment snippet included twice.");else{analytics.invoked=!0;analytics.methods=["trackSubmit","trackClick","trackLink","trackForm","pageview","identify","reset","group","track","ready","alias","debug","page","once","off","on"];analytics.factory=function(t){return function(){var e=Array.prototype.slice.call(arguments);e.unshift(t);analytics.push(e);return analytics}};for(var t=0;t<analytics.methods.length;t++){var e=analytics.methods[t];analytics[e]=analytics.factory(e)}analytics.load=function(t){var e=document.createElement("script");e.type="text/javascript";e.async=!0;e.src=("https:"===document.location.protocol?"https://":"http://")+"cdn.segment.com/analytics.js/v1/"+t+"/analytics.min.js";var n=document.getElementsByTagName("script")[0];n.parentNode.insertBefore(e,n)};analytics.SNIPPET_VERSION="4.0.0";      
      window.analytics.load('fZCJQR00sIALmSwOVTLkNR8caz4gsBaD');
      window.analytics.page();
      window.analytics.track('Order Progressed', { step : window.Shopify.Checkout.step });
      }}();    
  },
  gaLinker: function() {
    typeof window.ShopifyAnalytics.links == 'undefined' ? window.ShopifyAnalytics.links = [] : null;    
    
    var linksToDecorate = [];
    linksToDecorate.push(document.querySelector('.slideshow__heading-cta'));
    linksToDecorate.push(document.querySelector('#footer-buy'));
    linksToDecorate.push(document.querySelector('#footer-buy-two'));
    linksToDecorate.push(document.querySelector('.navigation__links >li.navigation__entrance-animation:first-child > a'));

    // Two footers for some reason
    Array.prototype.forEach.call(document.querySelectorAll('.site-footer__linklist >li:first-child > a'), function (node) {
      linksToDecorate.push(node)
    });

    linksToDecorate.forEach(function(link) {
      try {    
      link.addEventListener('click', function() {        
        ga('linker:decorate', link);
        dataLayer.push({
          event: 'clickedBuyButton',
          button: '#' + link.id + '.' + link.className
        })
      });
      window.ShopifyAnalytics.links.push(link);
    } catch(e) {}
    });
  }  
}
// Call init function
additionalGA.init();

How exactly we can use this script on the checkout page?

@prakashmalviya I wish I could help you but this is a very old script I don't use anymore.

I believe Shopify actually has hidden the 'additional scripts' for new customers anyway.