"I'll let you know if I think of anything useful. In the meantime, want to do this batch of medallions?" 

"Sure."

They do medallions.

It goes a little more smoothly as they get a routine going. This batch are anodized aluminum, etched with a species name and a per-species serial number.

When they're done, Margaret asks, "So I'm curious about your extortable rich person, but I don't know what you can tell me given patient confidentiality."

"I have not at any time gotten HIPAA certified so I don't know what I can tell you given patient confidentiality either."

"I just meant with respect to your conscience, not the law, but if the answer is 'nothing because I don't know what the law is' that's totally reasonable."

"Eh, more 'nothing because I don't know what my rich person's reasonable expectations might be shaped like'."

"That's fair. Let me know if you or they need any spells tested."

"Will do."

"And I think I'm about out of excuses to keep talking. Do you want to pick a date for our next meeting or should I just tell you when I have another dozen or two medallions prepped?"

"Just let me know, I don't have a day planner on me."

"Sounds good. I'll see you in probably a week or two, then!"

"Seeya! Have a good one!"

And she waves and goes.

And Margaret pushes the new website version with its new listings and its big banner saying "NEW: medallions!" with a link to an explanation, and then goes and coils on her bed in dragon shape and thinks. About Bella and forming a company and Bella and running a magic school (with Bella) and how to go about revealing various species to various other species, and Bella. She comes to a few conclusions, one of them being that she's much too nervous to do anything about the others right now, so instead she goes back online and starts looking at human advice for starting a company in the hope some of it transfers.

It's surprisingly difficult to find really actionable advice for starting a company online beyond that there might be reasons to incorporate in Delaware.

That's really annoying. Clearly she shouldn't have dropped out of Girl Scouts at age seven. Maybe either the public library or the Avalon library will have something; she'll look into that tomorrow. For now, she can do her homework and trace another set of medallion diagrams and then check her email and see if anyone has noticed her announcement. She's hoping for an order, but braced for either nothing or accusations of fraudulent-ness.

She gets an email about whether she means like, medallion medallions, or... something else?

Definitely medallion medallions! The listing for a pegasus medallion is a medallion a pegasus can use to turn human. The listing for a naga medallion is a medallion a naga could use to turn human. They look different from the existing ones because she doesn't want to confuse people into thinking she found them instead of making them, but they are otherwise identical as far as she can tell (except for including some previously-neglected species).

Questions keep coming in: can she do custom designs? Can she do one for centaurs? How do her medallions determine what people will look like in human form?

She can laser your favorite image on one of the blanks she's already got for a small surcharge, or you can wait until she sets up a PO box and then mail in a small object with no moveable parts and get it back medallionified. Centaur ones will very likely be available in the next week or two! Her medallions work the same as the old kind, and in particular if your natural form already has human parts those parts keep looking the same. 

How did she do this? Have they been tested? How strict is 'no moving parts', normal medallions have chains. Can she insure against the wrong person touching a medallion in transit?

She was able to duplicate the process by which earlier medallions were made (don't try this at home). Chains are fine, but only the thing on the chain will be the actual medallion. Medallions will be shipped very thoroughly packaged with tracking and insurance against loss, but she doesn't have a way of detecting fraud, so she can't insure against the wrong person opening it. 

She adds "lie detector" to her long-term project list, draws a couple more diagrams, and checks her inbox again.

Why shouldn't they try this at home? How did she duplicate it? Who were they tested on?

They shouldn't try it at home because runecasting is very dangerous, she's not going into detail on her process because it's a trade secret and also if she explains someone might try it at home, she's not giving out information on her test subjects. She compiles a FAQ with the questions she's had so far, in case anyone else has the same ones.

They slow down when the FAQ goes up.

That is generally the point of FAQs, so, good. And it frees her up to do some more tracing and eventually also her homework. She makes sure to take a break from tracing every thirty minutes to walk around a bit and make sure her brain isn't getting foggy.