# User Authentication Flow — Error Handling

Global exception mapping performed by `API.Core`'s `GlobalExceptionFilter`.
Applies uniformly across every authentication endpoint (registration, login,
refresh, confirm, resend, update-username/email/password/profile,
delete-account) — see the per-flow diagrams for where each exception type is
thrown.

```mermaid
--8<-- "web/diagrams/auth/error-handling.mmd"
```