Hey I read this thread - #1240
But am still not clear how we can proceed with app to web attributions.
In our case, during the trigger event (on the web) we have no way of knowing where the source originated (knowing would probably also violate the privacy Model).
But according to your API we most return a header that instructs where to search for the source - (Attribution-Reporting-Register-Os-Trigger - to search for the click in the OS | Attribution-Reporting-Register-Trigger - to search for the source in the browser).
Since we can't know were the source is from during the trigger event we can't decide what header to return.
We need an option to search in both locations.