Creates SBA (Story-Based Architecture) use cases in C# following the three-phase pattern (Load, Validate, Execute). Use when adding new business operations like creating invoices, issuing credit notes, transitioning statuses, or any domain action that combines data loading, validation, and execution into a single cohesive unit.
Implements two-tier error handling for the Fatturazione invoicing system following SBA patterns. Use when adding error handling to use cases, defining new domain exceptions, or setting up structured logging with actor context. Covers expected errors (validation, authorization) vs unexpected errors (infrastructure), logging levels, and exception-to-HTTP-status mapping.
Implementa feature nel sistema di fatturazione italiana validando contro normativa fiscale. Usa per aggiungere calcoli IVA, ritenuta d'acconto, split payment, imposta di bollo, gestione fatture PA, regime forfettario, numerazione progressiva, note di credito, o qualsiasi logica che deve rispettare DPR 633/72, DPR 600/73, DPR 642/72. NON usare per bug fix tecnici, refactoring, o modifiche UI senza impatto fiscale.
Writes xUnit tests for SBA use cases in the Fatturazione invoicing system. Use when creating tests for use cases, services, or validators. Follows the three-phase testing pattern (load failures, validation failures, execution success/failure) with NSubstitute mocking and FluentAssertions. Preserves the project's existing test conventions.