Tell me how to properly implement the task:
There are several domains ("ring" sites). To which users fall and wander through it. Domains are different. Then, as a result, they register on some site.
The task is to collect statistics on your own forces from which site and how they first entered before registering. It would seem logical to store information in the сессии/куках .
But how to transfer them between domains?
How is this implemented correctly?

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    Statistics banner on all pages on all sites. Can be invisible. Banner script on a separate domain. Cookies from the same domain. - Visman

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