Evaluate NFC tap-to-pay

dcposch commented 1 year ago

Background

By far the best card payment UX. Faster than swiping or chip-and-pin.
Much faster than mobile pay UX, search by name or scan QR.
Among currently-implemented NFC tap-to-pay, the gold standard is Apple Pay.

Mobile-to-mobile

Until recently, this was impossible to do in a mobile app. Android supports NFC device mode (tapping) and card mode (tapped, aka "host card emulation"). iOS only supports the former, or at least didn't expose card mode to apps.

Apparently it's possible now: https://stripe.com/terminal/tap-to-pay

Unclear if Stripe has a special deal.

Mobile-to-PoS

Definitely possible. An MVP PoS can just be an Android device on a stand.

Experiment

[ ] "Hello world" between Android devices. Works in x ms. Must be within y inches.
[ ] "Hello world" iPhone tapping Android. Works in x ms. Must be within y inches.
[ ] Demonstrate payment. Works in x ms end-to-end (physical tap to success sound).
[ ] Stretch goal: successful payment where tapping device is offline.