Ingress
Verified
Unsigned or stale events are rejected before mutation.
Platform Webhooks
Webhooks That Do Not Turn Retries Into Incidents
Provider callbacks are treated as distributed-systems inputs, not hopeful notifications. Zentra's event model starts with signature verification, duplicate protection, and operator-visible delivery histories.
- Signature verification
- Replay-safe processing
- Operator-visible delivery history
Replay-safe Events
PosterReplay-safe
Retries and reconciliation rendered as one deterministic flow.
Processing
Replay-safe
Retries do not become duplicate side effects.
Delivery
Traceable
Attempts and failures remain visible to operators.
Operations
Recoverable
Replays and dead letters stay bounded by the same safety model.
Event lifecycle
The webhook model should explain what happens before, during, and after the bad callback.
This is where weaker platforms become operationally expensive. Good webhook infrastructure is not just delivery. It is trust at every step of the event lifecycle.
Stage 01
Receive
Callbacks enter through one explicit ingress with preserved attempt metadata and delivery context.
Stage 02
Verify
Signature and freshness checks happen before business logic touches the payload.
Stage 03
Deduplicate
Event identifiers and write boundaries prevent retries or duplicate deliveries from mutating state twice.
Stage 04
Record
Every attempt, outcome, and terminal state remains inspectable for support and incident workflows.
Stage 05
Recover
Retries, dead letters, and manual replays stay bounded by the same safety rules as the first delivery.
api/v1/transfersstable
POST /transfers
idempotency_key: trf_8172
amount_minor: 125000
currency: "USD"
Webhook event
status: processing
attempt: 2
signature: verified
Contract guarantees
Stable error codes
Replay-safe retries
Typed schema evolution
Observed outcome
1 result
Three delivery attempts converge to one ledger-safe mutation.
- Require signature and freshness checks for all provider callbacks.
- Reject malformed or unsigned events before touching business state.
- Preserve the failed attempt for operator review without replaying unsafe state changes.
Failure posture
If webhook handling is vague, the incident response will be worse.
Production failures usually arrive as delayed callbacks, duplicate deliveries, or provider outages. The platform needs to make those states visible enough for humans to recover them safely.
Duplicate deliveries should converge to one outcome.
Delayed callbacks should preserve their relationship to the original request.
Manual replay tools should follow the same safety rules as live traffic.
Launch With Control
Treat Webhooks Like A Distributed Systems Boundary, Not A Notification Layer.
Use replay-safe event handling that verifies ingress, contains duplicates, and keeps delivery history legible for operators.
The production move should feel as stable as the sandbox rehearsal. Contracts, traces, and support paths remain aligned throughout the rollout.
