This has nothing to do with drug ordering or buying. Pharmacies buy medicines from medicine distributors, namely McKesson, Cardinal, and AmerisourceBergen. It

This has nothing to do with drug ordering or buying. Pharmacies buy medicines from medicine distributors, namely McKesson, Cardinal, and AmerisourceBergen. It is literally all just “paperwork” between pharmacies and insurers. The PBM is just the department of an insurance company that “negotiates” pricing for medicine.