01 / BusinessWhat really needed solving
An invoice is the outcome of an agreement, rules and valid data. Accelerating generation without those foundations multiplies correction costs. The described engine links pre-validation, batch processing and the collection cycle.
02 / DesignWhy this structure matters
Batch processing concentrates repetitive tasks, while agreement-level traceability helps reconstruct events. Retries and alerts are part of operating a process, not cosmetic extras. This is deterministic execution: the case does not document an AI reasoning layer.