Webhook Signature Verification — FastAPI (Free)

$0.00

Production-ready webhook signature verification: constant-time HMAC-SHA256 plus Redis-backed idempotency.

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Description

Production-ready signed-webhook verification.

A microservice that validates HMAC-SHA256 signatures in constant time (Standard Webhooks / Svix), rejects requests older than 5 minutes, and guarantees idempotency via Redis keyed on the webhook-id — so a duplicated payment can’t grant access twice.

Requirements: Python + Redis.

Status: 5/5 tests passing.

Honest limitation: this is a manual implementation of the standard — the official provider helper wasn’t published yet when this was built. Not included: your own business logic (provisioning, licensing, database).

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