Place enforcement in an API gateway

An API gateway can block routed requests using authenticated caller and normalized operation context.

01 / The operating case

What changes in a real workflow?

A billing agent calls a payment API through a gateway, but a batch worker uses a private endpoint.

Trace the authority boundary
  1. 01Authority origin
  2. 02Task and grant
  3. 03Current decision
  4. 04Observed outcome

02 / Decision contract

What the executor must check

Authenticate workload, validate audience, extract target and amount where safely possible, query current authority, and force all payment paths through equivalent enforcement.

InputPrincipal · task · action · target
DecisionGrant ancestry · policy · current state
ResultEnforce · record · verify outcome

03 / Failure and evidence

What goes wrong, and what can be proven?

Failure mode

Gateway coverage is assumed universal even though a direct private route remains.

Evidence to retain

Reconcile gateway decision IDs with payment API transaction IDs.

04 / Canonical scope

Why this reference stands alone

Tool wrappers operate before transport; this page owns routed API policy and topology.

Illustrative implementation artifact

Gateway coverage proof

protected API routes = enumerate network and private paths
for every mutation route: require authenticated principal
  + trusted task context + decision binding
reconcile API write IDs with gateway decision IDs

Primary references

Read the underlying material

Architecture discussion

Choose one consequential action and make its boundary explicit.

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