The Alternate ID field, located in the affiliate's details, can store a custom affiliate ID.  This allows you to store and pass your own custom affiliate specific ID from LinkTrust to your CRM or website landing page. Adding the token [=AltID=] to a campaign’s Tracking URL or Landing Page URL automatically populates your specific alternate ID value to the URL. Since this field can be used as a token in URLs, only URL friendly characters can be saved in the Alternate ID field.  This alternate ID does not replace the AFID name value pair on the affiliate's Tracking URL.