API & Workflow Failure Diagnosis
This synthetic example demonstrates the $149 delivery format. It contains no customer system, paid engagement, private logs, or claim of production repair.
Effective September 21, 2026
Failure statement
A checkout webhook is accepted by the HTTP endpoint, but a duplicate or mismatched event can incorrectly advance fulfillment. Expected behavior: only a recent, authentic, exact-offer event tied to a Zinvyl-issued purchase reference may create a funded state.
Evidence-backed diagnosis
The contained test path isolates five gates: signature freshness, live/test separation, exact payment-link-to-offer mapping, amount and currency equality, and terms plus purchase-reference reconciliation. A failure at any gate returns a non-success state and cannot authorize fulfillment.
Red/green acceptance set
| Case | Expected result |
|---|---|
| Valid signed live event for exact offer and amount | Funded ledger transition; fulfillment record may be created |
| Invalid or stale signature | Rejected; no ledger transition |
| Test event sent to live mode | Rejected; no live revenue or work authorization |
| Wrong offer, amount, currency, or missing terms consent | Rejected or held for reconciliation |
| Duplicate event | Idempotent acknowledgment; no duplicate purchase or fulfillment |
Change boundary
The sample covers diagnosis and deterministic tests only. It does not include production credentials, deployment, emergency response, whole-system redesign, or a guarantee that an unrelated buyer failure has the same cause.
Read the complete service contract · Request the bounded $149 diagnosis