Hi @a_echols , An integration code is an alternate ID you can use
instead of the Data Source ID, assigned by Audience Manager. If we are
planning to change it, we need to update the same integration code in
visitor Id implementation as well.For information on visitor Id service
implementation, please refer to doc
below:https://experienceleague.adobe.com/docs/id-service/using/reference/authenticated-state.html?lang=en#reference
Regards,Shweta