We are receiving source-app-id, but it looks to us like its dependent on the number of installs within a time window for a given publisher (our best guess is a rolling 24 hour window).

The pingback delay profile has worked ok for us. A few things to make sure of : If you are testing with an App that isn't downloaded from the Store, make sure you have source = 0 in the payload before it is signed. Make sure the App you are testing with has SkAdNetwork ID you have in your signed payload in it's plist. Make sure that the SkAdNetwork ID in your plist is lowercase and the same in the payload you signed. (It does also work if both are in uppercase, but the documentation now explicitly says it should be lowercase)