Couple points of feedback I'm interested in for this essay

1. Add card to autofill (feels so obvious, not sure why no one's done it): https://kunle.app/checkouttarget.html#/creditCard/4242424242...

2. Using Web3 models of authentication for credential exchange (I feel like this is simpler than typing in a card because every financial institution has a mobile app at this point? What am I missing)

3. Using a well known URL for credential exchange (similar to the well known URL scheme being proposed for password resets: https://w3c.github.io/webappsec-change-password-url/)