A prescriber does not experience prior authorization as a policy. They experience it as a phone call, three days later, about a decision they thought they had already made.
That gap between the decision and the consequence is the whole problem. Everything else is detail.
The callback is the symptom
Formulary information exists. It is published, it is public, and in most cases it was available at the moment the prescription was written. It simply was not in the room.
Closing that loop does not require new data. It requires the data that already exists to arrive before the decision instead of after it.