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software architecture · billing

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.

Type Control-systems block diagramStandard Ogata / standard controls textbook conventionEngine schematex-blockdiagramUpdated 9/24/2026
C4 Code View for Invoice Generation
Drawing preview
The request

“A C4 code-level diagram for invoice generation. An invoice request reaches an invoice handler, which uses a tax calculator, PDF renderer, invoice repository, email sender and ledger client. The invoice repository stores documents in document storage.”

Then tryAdd a currency conversion client to the handlerAdd a retry queue for failed email delivery
What is in this drawing

Read the decisions behind it.

01Coordinator role

Keeps invoice workflow in a single handler.

02Specialist classes

Separates tax calculation and PDF rendering.

03Boundary clients

Shows persistence, delivery and ledger collaborators.

Use this close-up C4 view to discuss the code-level responsibilities behind invoice generation.

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FAQ

Common questions

Is a C4 code view a class diagram?

It can use code-level elements, but it should emphasize important responsibilities and relationships rather than every class.

Why use an invoice handler?

It provides one place to coordinate the workflow across calculation, rendering, storage and delivery.

What should be omitted?

Framework internals and minor helper functions that do not help readers understand the design.