How to setup tracking with GTM?

Step 1: Capture reid from URL param into Cookie
Create new Tag:

• Type: Custom HTML
• Name: Exerta - Save reid to Cookie
• HTML:

<script>
  (function() {
    var reid = new URLSearchParams(window.location.search).get('reid');
    if (reid) {
      document.cookie = "reid=" + reid + "; path=/; max-age=" + 60 * 60 * 24 * 30;
    }
  })();
</script>

Step 2: Read reid from Cookie
Create new Variable:

• Name: Exerta - Click ID from Cookie
• Type: Custom JavaScript

function() {
  var match = document.cookie.match(/(?:^|; )reid=([^;]*)/);
  return match ? match[1] : '';
}

Step 3: Send Postback on Conversion
Tag:

• Type: Custom Image
• Name: Exerta - Conversion Postback
• URL:

https://api.reengage.ai/postback/team1/YQUVxOc7pxglaJ1k361oqWuusd0UPQin63W4AEorkSw/?reid={{Exerta - Click ID from Cookie}}&revenue={{replace_with_your_purchase_amount_variable}}

1. Take your unique tracking link in your tracking setup dashboard https://reengage.ai/dashboard/setup
2. In the URL, replace this part {replace_click_id} with {{Exerta - Click ID from Cookie}}
3. In this URL, replace this part {replace_conversion_value} with your existing GTM variable that contains the purchase amount (e.g., total transaction value).

...&revenue={{Transaction Value}}

​

🧠 Example Final URL in GTM Tag:

https://api.reengage.ai/postback/team1/YQUVxOc7pxglaJ1k361oqWuusd0UPQin63W4AEorkSw/?reid={{Exerta - Click ID from Cookie}}&revenue={{Transaction Value}}

Note: You must have both the Exerta - Click ID from Cookie and the correct purchase value GTM variables already configured.

• reid is saved on the first page view (from URL)
• revenue is pulled from you_variable_for_purchase_amount
• Postback fires on successful purchase