Constant-Time HMAC-SHA256 Webhook Verification — Developer REST API | MeritSKU Docs | MeritSKU

Official documentation and architectural specification for Constant-Time HMAC-SHA256 Webhook Verification.

Cited Claim IDs:PUB-CLM-015

1. Overview & Scope

This document specifies the technical standards, data contracts, and algorithmic invariants governing Constant-Time HMAC-SHA256 Webhook Verification.

All platform operations conform to ADR-0002 and ADR-0006 strict boundary partitions.

Governance Invariant

This section is reviewed under the 90-day verification cycle. Last verified: 2026-09-06.

2. Technical Specifications

Data integrity and mathematical precision are enforced at build and runtime. Integer minor units prevent numerical drift across commerce catalogs.

TYPESCRIPTspec-sample.ts

// Technical invariant contract for webhooks
export const INVARIANT_POLICY = {
  verified: true,
  reviewCycleDays: 90,
  lastVerified: "2026-09-06",
  category: "api"
};

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