---
title: Peerius tracking tag
slug: product-recommendations/docs/peerius-tracking-tag
docTags: 
createdAt: 2026-07-30T20:41:31.415Z
---

For Optimizely servers to supply personalized content to your site, you need to include a link to the Optimizely Recommendations JavaScript integration code in all pages of your UAT and live websites.

When you first configure your site to use JSON, include the following tag on all pages of your UAT site (including [Checkout page](docId\:Ivwro7oelZzxxndRDdlks) and [Order page](docId:-M5d9ioC7abM7aw49JYFd)) :

## UAT domains

Replace `<sitename>` with your site name.

### Standalone clients

```javascript
<script type="text/JavaScript" 
        src="<sitename>.uat.productrecs.optimizely.com/tracker/peerius.page" 
        charset="UTF-8">
</script>
```

### Native clients

```javascript
<script type="text/JavaScript" 
        src="<sitename>.uat.productrecs.optimizely.com/tracker/peerius.page" 
        charset="UTF-8">
</script>
```

:::hint{type="info"}
**Note**
Ensure that the UAT script is placed on your UAT site.
:::

## Production domains

- Sweden (SE) cluster – `<sitename>`*.eu1.productrecs.optimizely.com/tracker/peerius.page*
- United Kingdom (UK) cluster – `<sitename>`*.eu2.productrecs.optimizely.com/tracker/peerius.page*
- United States West (US) cluster – `<sitename>`*.uswe01.productrecs.episerver.net/tracker/peerius.page*

You need to add the production version of the script to your live site in the same way:

```javascript
<script type="text/JavaScript" 
        src="//sitename.eu1.productrecs.optimizely.com/tracker/peerius.page" 
        charset="UTF-8">
</script>
```

The `sitename` element is provided by Optimizely.

:::hint{type="info"}
**Note**
Do not add the script mentioned above inside `<div>` tags, because it may cause Internet Explorer to crash.
:::

Position this tag just above the `</body>` tag, before any Google Analytics scripts or slow-loading social media tags.