Adobe Experience Cloud ID aka Marketing Cloud ID aka MCID aka Visitor ID Service is a must-have component in every modern implementation of Adobe Analytics. Have a look at an implementation audit of American Airlines. Get to know how to correctly implement and test Experience Cloud ID.
Experience Cloud ID Service is the recommended visitor identification method for all Experience Cloud solutions including Adobe Analytics. It provides a universal ID that identifies visitors across the solutions.
Every Adobe Analytics server call contains the mid parameter with the ID populated as a value when the ID Service is implemented correctly. If the mid parameter exists only in a part of server calls, this will negatively affect the visitors identification on the backend of Adobe Analytics (and other solutions) excepting the cases when the ID Service Grace Period is configured and active.