Use case: Chargeback — item not as described

Policy/version: seal the return/refund policy version that applied at purchase time (hash-only).
Order artifacts: seal invoice PDF + shipment proof record hashes.
Bundle: generate the Evidence Sheet + Proof Card + Receipt JSON and respond with one consistent pack.

Pain: chargeback evidence is often fragmented (policy screenshots, emails, shipment notes). A single integrity timeline reduces the “insufficient evidence” risk.