Just set up a functionnal snowplow mini interface and can collect data from 2 external sites.
The only issue I have now is to track user between the 2 platforms.
network_userid values are different and user_id is just empty while I have the same sp_id in the cookies in debugger tools such as Fiddler or Chrome Console.
domain_userid are also different from a platform to another.
Do you know what kind of value I can use to identify a visitor across the 2 platforms?