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The WebAuthn login flow facilitates FIDO2 authentication within the Identity Provider (IdP) by utilizing the Web Authentication API (WebAuthn), which is part of the FIDO2 standard. This enables strong, public-key-based authentication for users. The plugin can function in several ways: as a single-factor authentication method within a broader multi-factor authentication framework; as a single-factor method passwordless authentication where the user first supplies their username (passwordless flow); or as a single-factor method where the username is not provided by the user (usernameless flows using passkeys), or usernameless authentication where the user selects a passkey credential to use directly from the authenticator.