Originally Posted by
moondog
Perhaps you're think about this?
Online arrival card - effective Nov 20, 2025
If you are interested in eChannel, most of the info in the earlier posts is still valid. The short version is that if you're eligible, you need to register upon arrival (usually between immigration and customs) and update biometrics at the same desks every time your documents change (they might be getting better in this regard).
I have needed to update docs each time. At some airports, you can also do it at exit (in my experience this is possible at PEK T3)