https://www.corbado.com/blog/iframe-passkeys-webauthn

Probably this can be understood by nostr developers here more than pure bitcoin developers. Because passkey is used as "identity by public key", and cooperates between a merchandise site and payment gateway services.

Imagine replacing Passkeys with Nostr and replacing MasterCard with Bitcoin. The 3-layer structure of merchants, payment gateways, and banks would be reduced to at least 2 layers (bank out), or just 1 (only merchants).

From creditcards vs bitcoin to creditcards×passkeys vs bitcoin×nostr

NOTE: This framing may be too simplistic. Other combinations such as Nostr and Passkey, payment gateways and Bitcoin, or passkey and Bitcoin(!) may work together.