hey, as far as I understand, If you want to use non-expo push services then you have to detach.
from this post it seems like expo needs some extra metadata to correctly send the notification to your javascript code. I’m not sure about the case where your server communicates directly with apple and google, but it seems like you need to detach for that.
if i’m correct and this is the only solution, Notification.getDevicePushTokenAsync() should be useful for setting things up (seems to not be in the docs for some reason).
More details about push notifications in detached app.