The quotes API supports draft/save/submit style workflows. Treat quote payloads, attachments, totals, and revision history as one audit trail so operators can always explain what changed and when.
Typical quote flow
Create or update a draft while the supplier is still editing.
Attach supporting files and keep human-readable labels where available.
Submit the quote only when totals and lead times are final and customer-facing.
Operational safeguards
Do not mutate accepted quotes silently; create explicit revision events.
Keep retry behaviour idempotent so duplicate submits do not create duplicate customer actions.
Record attachment provenance so operators can tell whether a quote was pasted, uploaded, or manually entered.