> The 3rd party app has to first discover their API, someone has to understand it and write code to use it, and then deploy that code.

I think this would be a better integration point for AI. It could look at the fields and learn to fill them out automatically (name, age) and prompt the user for anything missing. Then instead of the barber shop needing a universal AI users just need their personal AI (or a script) to interact with the API.