Generate Registration Options

The username which uniquely identifies the user, e.g. email address. Will be inferred from an existing user identifier if not passed.

An additional identifier which will be displayed to the user to help them recognize the passkey.

The preferred authenticator type. Set to platform for the device authenticator, cross-platform for a roaming authenticator, or null to let the user choose.

Register a Secure Payment Confirmation (SPC) credential for use in 3-D Secure payments. When true, Authsignal forces a platform authenticator with required user verification and the WebAuthn payment extension, and marks the stored credential payment-capable.

An optional payment instrument label (e.g. "Visa ••1234") persisted against an SPC credential and shown in future payment dialogs. Only applies when securePaymentConfirmation is true.

The ID of the passkey challenge. Should be passed back to the complete the registration.