Five service modules realise Orders

Context

The product registry groups cart, sale, selling declarations, rights and acquisition costs together. Purchasing's future home remains open.

Decision

The design retains the registered five-module boundary. Shared persistence supports in-process coordination, while each service facet retains its record ownership.

Alternatives Considered

Separating checkout from sales would divide their placement responsibility without changing the shared transaction. Moving purchasing now would anticipate an unanswered ownership decision.

Consequences

The placement API commits several owners' records. A purchasing move would require coordinated registry, contract and ownership changes rather than silently relocating its artifacts.