That is being tried, and worked well on one patient it seems, and a second more recent one: https://www.nature.com/articles/d41586-019-00798-3

Stripe does have a physical terminal too (https://stripe.com/terminal) but I've never seen it at a merchant.

Huh, I did not know that, I’ve also never seen one out in the wild.

You probably have. They're completely non-desccript and unbranded, unlike most other POS solutions, so you're likely to not remember it.

I just recently noticed some- Jimmy John's uses the stripe Verifone reader and Toast tablets use the BBPOS Chipper (but this may not be thru stripe). These readers are "stripe-compatible," but not exclusively for stripe.

2018: "Square become Stripe, while Stripe becomes Square"

Stripe's bread and butter is payment backends, while Square was the point-of-sales system

https://news.ycombinator.com/item?id=18007454

Are there any active efforts to standardize a structured data format for these transactions so that in the future you might not have to do any ‘guesswork’, at least when dealing with more forward thinking banks?

Absolutely. Check out our efforts in Plaid Exchange: plaid.com/plaid-exchange/ It’s an open finance solution that helps financial institutions build secure and structured APIs. Some of the most innovative institutions are building onto it and finding value in offering a better experience to end customers, even if it’s outside their application.