@Override
    public Collection<CredentialRegistration> getRegistrationsByUserHandle(final ByteArray handle) {
        return stream()
            .filter(registration -> handle.equals(registration.getUserIdentity().getId()))
            .collect(Collectors.toList());
    }
This is {@link BaseWebAuthnCredentialRepository}.

@author Misagh Moayyed
@since 6.3.0
support/cas-server-support-webauthn-core/src/main/java/org/apereo/cas/webauthn/storage/BaseWebAuthnCredentialRepository.java