UrlAppend
You must set AutoTrack to true to enable this feature.
When this parameter is set to true in the Bulk or Transactional API, it will automatically append the supplied string to the end of each URL in your HTML Template. This can be very useful for tagging links for use by your Web Analytics software.
For Accelerator Marketing Campaigns, it's always set to true.
Let's suppose you are using the following HTML Template:
<html>
Click <a href="http://www.mycompany.com/purchase?product=123">here</a>
to purchase our great new product!
</html>
When a campaign is launched and the campaign UrlAppend is applied(e.g. utm_source=google&utm_medium=email&utm_campaign=campaign-123) and the template will render as follows:
<html>
Click <a href="http://www.mycompany.com/purchase?product=123&utm_source=google&utm_medium=email&utm_campaign=campaign-123">here</a>
to purchase our great new product!
</html>
The UrlAppend string can also be personalized, so it can reference data in your Audience. For example, setting your UrlAppend string to utm_source=${Recipient.Source}&utm_campaign=${Recipient.CampaignId} is perfectly valid.