Webhook Signature Error

Overview

A webhook signature error occurs when a receiver cannot validate the provided signature against the expected message, key, algorithm, or freshness rules. Causes include wrong secret, rotated key, altered body, parsing before verification, encoding differences, missing headers, clock skew, expired timestamps, malformed values, or forged requests. Logging the full signature, secret, or sensitive payload while debugging can worsen an incident. Operators should compare raw-byte handling, key identity, timestamps, and provider configuration. Business actions triggered by Webhook Signature Error should be idempotent and should verify the current object state before fulfillment or accounting updates. A receiver should treat transport acknowledgement and successful downstream processing as separate states for Webhook Signature Error.

For Webhook Signature Error, assertions should verify final provider and business state, not only an HTTP status or locally mocked response. Webhook Signature Error is a verification failure state whose cause may be wrong raw bytes, secret, algorithm, encoding, timestamp, or key rotation rather than a provider outage. A sudden error spike may indicate configuration drift, proxy changes, provider rotation, or active attack. Receivers should reject safely, return the documented status, record sanitized reason and correlation data, and alert on abnormal rates. Recovery for Webhook Signature Error should combine replay controls with an authoritative status check rather than trusting delivery history alone.

Monitoring for Webhook Signature Error should track delivery age, signature failures, duplicate rate, retry exhaustion, and unresolved business events.

Replay of Webhook Signature Error should preserve original identifiers and timestamps so historical processing cannot masquerade as a new event.