Pick the right C4 diagram level

Sort each question into the C4 level that best answers it. System context Container Component Code Which external systems does checkout depend on? Do we have a web app, API, worker, queue, and database? Which modules inside the API own pricing, tax, and payment? Which class or function parses the coupon rule? Who are the human and system actors around billing? Which deployable unit consumes invoice events? How does the notification service split templates, preferences, and delivery? What method formats the localized currency string?

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