| Request and classification | Requester and procurement policy | Source, identity, fields, purpose, category, attachments, and timestamp | A complete form is eligible or approved |
| Supplier review or selection | Procurement and authorized stakeholders | Candidate identity, approved sources, criteria, evidence, conflicts, decision, and reason | A model score is a final award |
| Approval | Authorized procurement or finance role | Approver identity, role, decision, version, threshold, reason, and time | Silence or a generated PO means approval |
| Order and supplier response | Procurement system and supplier | PO ID, version, destination status, delivery reference, acknowledgement, and change | HTTP success means accepted terms |
| Receipt and invoice match | Receiver, AP policy, and accounting records | Linked lines, quantities, condition, invoice differences, tolerances, and decision | Delivery proves an invoice is valid |
| Completion | Authoritative systems and process owner | Accepted statuses, unresolved exceptions, reconciliation totals, and operating metrics | One successful record proves the population is complete |