> ## Documentation Index
> Fetch the complete documentation index at: https://docs.exerta.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# How to setup tracking with GTM?

> Step-by-step instructions for setting up Exerta conversion tracking using Google Tag Manager.

![:small\_blue\_diamond:](https://cdn.prod.website-files.com/69adbb899d077b240008e323/6a7cc48ca5135499fb6a74cd_f94f996c58-1f539_2x.png) Step 1: Capture `reid` from **URL param** into Cookie\
**Create new Tag:**

* Type: Custom HTML
* Name: `Exerta - Save reid to Cookie`
* HTML:

```html theme={null}
<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>
```

Trigger: All Pages

<figure>
  <img src="https://cdn.prod.website-files.com/69adbb899d077b240008e323/6a7cc48874b5f1a55f1b61f1_46ccebf36e-Screenshot_2025-06-26_at_11.12.44.png" alt="" />

  <figcaption />
</figure>

![:small\_blue\_diamond:](https://cdn.prod.website-files.com/69adbb899d077b240008e323/6a7cc48ca5135499fb6a74cd_f94f996c58-1f539_2x.png) Step 2: Read `reid` from Cookie\
**Create new Variable:**<br />

* Name: `Exerta - Click ID from Cookie`
* Type: Custom JavaScript

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

<figure>
  <img src="https://cdn.prod.website-files.com/69adbb899d077b240008e323/6a7cc48cadcab771524ede71_f3c749e3de-Screenshot_2025-06-26_at_11.14.23.png" alt="" />

  <figcaption />
</figure>

![:small\_blue\_diamond:](https://cdn.prod.website-files.com/69adbb899d077b240008e323/6a7cc48ca5135499fb6a74cd_f94f996c58-1f539_2x.png) Step 3: Send Postback on Conversion\
Tag:<br />

* Type: Custom Image
* Name: `Exerta - Conversion Postback`
* URL:

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

**Important notes:**

1. **Take your unique tracking link in your tracking setup dashboard** [**https://reengage.ai/dashboard/setup**](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).

For example, if your GTM variable is named `Transaction Value`, update the postback like this:

```
...&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.

Trigger: Use the existing **conversion** trigger that you use in your GTM<br />

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

<figure>
  <img src="https://cdn.prod.website-files.com/69adbb899d077b240008e323/6a7cc4893f264355f4608241_8e08b76462-Screenshot_2025-06-26_at_11.16.08.png" alt="" />

  <figcaption />
</figure>

To test it out, you can use GTM debug tool or browser dev tools with custom param reid=reid\_afzgntgixuc, it should be sent in GET request like so:

<figure>
  <img src="https://cdn.prod.website-files.com/69adbb899d077b240008e323/6a7cc48aab60581c2282ed9c_a1bf67f623-Screenshot_2025-06-26_at_11.53.58.png" alt="" />

  <figcaption />
</figure>

4 files


## Related topics

- [How to setup tracking](/analytics/tracking-setup.md)
- [Revenue Attribution: Track Sales Back to Every Comment](/analytics/attribution.md)
- [Exerta Basics & FAQ](/account/faq.md)
- [How to Set Up Custom Domain](/account/custom-tracking-domain.md)
- [AI Agents Overview: How Exerta Automates Engagement](/agents/overview.md)