The top of the american medical bureaucracy. Here's the deal: the state of NY imposed a mandatory provision that all the prescriptions should go electronically. Which means every health office (practice, clinic, whatever) has to have some app which will send the prescription to the pharmacy via fax, email, whatever. Directly? Ah, no. There's a series of providers, like that BestRx, who send the actual faxes and emails, as they have accumulated data about pharmacies (most probably from phone records and ads and whichever public data were available) and medications (from what pharmaceutical companies provide), you just send them the data (in the format they specify) and then they'll make sure it arrives at your pharmacy of choice.
But since the format they have is kind of mysterious and heavy, they don't want to deal with every app out there, they'll have intermediaries, aggregators or whatever, who will do that. So there are three middlemen between the doctor and the pharmacy, or four between doctor and patient: 1) we, who provide the app where the prescription originates, 2) this outfit which will collect the data, check against databases, validate and verify, 3) these BestRx guys who will take that and deliver to the pharmacy, 4) the pharmacy itself.
Complicated? Sure it is, but we all make money on it.
They had us pass some certification test, i.e. make sure my FedsRx plugin sends all the required data in proper format. The format is headless xml (!). They validate whatever we send - for instance, the patient has to have at least one phone number (home, work, mobile, other). However, they print only the home number, and nowadays there are more and more people who don't have a landline, cell phone is the one. So for many patients there is no phone printed on the prescription (i.e. on the fax or the emailed pdf). I warned these guys early on, even before the certification. Two years later, this is still a problem.