C4 Code View for Invoice Generation

This code-level C4 view focuses on one invoice-generation workflow rather than the entire billing system. An invoice handler coordinates tax calculation, document rendering, persistence, email delivery and ledger communication. The repository owns the connection to document storage, leaving the handler responsible for the workflow rather than storage details. This drawing is useful when a team needs to agree on collaboration boundaries before implementation or refactoring. It should remain selective: show the classes or modules that carry meaningful responsibilities, not every utility or framework object. Add retries, currency conversion, tax-provider clients or asynchronous delivery only when those behaviors are central to the design.