If you want to capture UTM values at sign up for sake of marketing attribution, you can do so by adding auth.registrationDefaults to your Outseta Script Options found in the code you've already added to your site's head.

1. Start by creating a custom property on your account records to store your UTM values.

2. Update the Outseta script in the header of your site to set registration defaults. Here’s some sample code on how to set registrationDefaults from a cookie:

<script> 
var o_options = { 
  domain: 'your-domain.outseta.com', 
  auth: { 
    registrationDefaults: { 
      Account: { 
        UtmValue: $.cookie('utm') 
      } 
    } 
  } 
}; 
</script>

3. How you store the UTM code when the visitor arrives on your site is up to you.