When you first configure your site to use JSON, include the following tag on all pages of your UAT site (including [Checkout page](🔗) and [Order page](🔗) :
## UAT domains
### Standalone clients
### Native clients
Ensure that the UAT script is placed on your UAT site.
## Production domains
United Kingdom cluster – _\<sitename>.peerius.com _
Sweden cluster – _\<sitename>.peerius.episerver.net_
United States West cluster – _\<sitename>.uswe01.productrecs.episerver.net_
You need to add the production version of the script to your live site in the same way:
clientname` element is provided by Optimizely.
Do not add the above script 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.