# Advanced Behaviors

- [Fake Credentials](/symfony-bundle/advanced-behaviors/fake-credentials.md)
- [Register Additional Authenticators](/symfony-bundle/advanced-behaviors/register-authenticators.md)
- [Debugging](/symfony-bundle/advanced-behaviors/debugging.md)
- [User Verification](/symfony-bundle/advanced-behaviors/user-verification.md)
- [Attestation and Metadata Statement](/symfony-bundle/advanced-behaviors/attestation-and-metadata-statement.md)
- [Authenticator Selection Criteria](/symfony-bundle/advanced-behaviors/authenticator-selection-criteria.md)
- [Authentication without username](/symfony-bundle/advanced-behaviors/authentication-without-username.md)
- [Extensions](/symfony-bundle/advanced-behaviors/extensions.md)
- [Authenticator Counter](/symfony-bundle/advanced-behaviors/authenticator-counter.md)
- [Dealing with “localhost”](/symfony-bundle/advanced-behaviors/dealing-with-localhost.md)