The app IS the data source — unlike web 5 OS signals, GPS, carrier flow automatically 1 Publisher sets FPD via targeting API 2 No client-side module system. PBS modules 34 enrich server-side with device detection, audience data — 3rd party data.
FIELD NOTES
- GPS geo.type=1 commands ~6x premium over IP-derived in geo campaigns
- FPD access varies: imp.ext.data bypasses bidder ACL entirely
- Most apps ship minimal FPD — targeting API requires explicit code