title: GTM: Using transactionProducts Varible for Custom HTML Tag
body: <p>I'm using the Google Tag Manager (GTM) with E-Commerce-Tracking. The Shop-System sends the following information to the GTM:</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false">
  <div class="snippet-code">
  <pre class="snippet-code-html lang-html prettyprint-override"><code>dataLayer = [{
  "event":"transaction",
  "transactionId":"100002486",
  "transactionDate":"2015-09-03",
  "transactionTotal":295,
  "transactionShipping":0,
  "transactionTax":26.82,
  "transactionPaymentType":"Rechnung",
  "transactionCurrency":"EUR",
  "transactionShippingMethod":"tablerate",
  "transactionProducts":[
  {
  "name":"Handelsvertretergesetz",
  "sku":"9783700760344",
  "category":"Buch",
  "price":113.64,
  "quantity":1
  },
  {
  "name":"Steuerrecht",
  "sku":"9783700759294",
  "category":"Kodex",
  "price":77.27,
  "quantity":2
  }
  ];</code></pre>
  </div>
  </div>
  </p>
  
  <p>Analytics E-Commerce Tracking works perfectly. But now to the challange:</p>
  
  <p>I need to implement another Non-Google E-Commerce-Tracking Code via the GTM which in end should look like this:</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false">
  <div class="snippet-code">
  <pre class="snippet-code-js lang-js prettyprint-override"><code>ScarabQueue.push(['purchase', {
      orderId: '231213',
      items: [
        {item: '182', price: 19.9, quantity: 1},
        {item: '747', price: 29.7, quantity: 3}
      ]
  }]);</code></pre>
  </div>
  </div>
  </p>
  
  <p>So I thought I just add another Custom HTML Tag via the GTM:</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false">
  <div class="snippet-code">
  <pre class="snippet-code-js lang-js prettyprint-override"><code>&lt;script&gt;
  ScarabQueue.push(['purchase', {
      orderId: '{{transactionId}}',
      items: [
        {{transactionProducts}}
      ]
  }]);
  &lt;/script&gt;</code></pre>
  </div>
  </div>
  </p>
  
  <p>While the {{transactionId}} gets inserted correctly, the items are missing.</p>
  
  <p>Any idea how to get the {{transactionProducts}} Variable into a Custom HTML Tag? Thanks!</p>