How does the Marketing Cloud ID service maintain a consistent ID across domains?

[jantzen_b]

How does the Marketing Cloud ID Service (MCID) maintain a consistent ID across domains and web properties in browsers that accept third-party cookies?

[jantzen_b · Accepted solution]

It does this by utilizing the IMS org ID deployed in your VisitorAPI.js file and a third-party Demdex cookie.

The following knowledge base article shows how this process works and the associated network requests. There is also a video that walks through a scenario.

https://helpx.adobe.com/marketing-cloud-core/kb/MCID/CrossDomain.html

[Former Community Member]

Thanks for The information Mr Jantzen belliston , That was really helpful.

[Edit] - Removed Spam Link