Flow baseline
Incoming API events progress through decode, validation, mapping, policy checks, connector execution, and final audit emission. Each stage should complete with deterministic outputs.
Flow phases
Inbound plane
Ingress -> AuthN/AuthZ -> Schema Validation -> Idempotency Check
Reject unauthenticated or malformed requests before any policy expansion.
Transformation plane
Mapper -> Policy Engine -> Entitlement Gate -> Connectors
Keep source-of-truth boundaries explicit and owned.
Operational invariants
- No stage may mutate source intent silently.
- Policy failures must include stable error IDs and retry recommendations.
- All side effects are logged with immutable correlation keys.
Failure branching
Retries follow explicit classification: transport failures can retry, validation failures should not replay without operator correction, and mapping failures should create a remediation task with input diff.
Flow visibility
Request -> Validator -> Attribute Mapper -> Policy Engine -> Connector Adapter -> Audit Sink
Add correlation IDs at ingress so all downstream steps are searchable and explainable.
Filtering and pagination edge behavior
Replay-safe flow pattern
Request with opaque cursor -> Filter validation -> Sorted index query -> Deterministic limit -> Auditable page token
Cursors and sort order must be stable before any mutation path is allowed.
- Reject filters with mixed operators that cannot be normalized to server index plans.
- Return explicit next-page tokens and keep request order stable across retries.