The Webhook Failure Modes Nobody Warns You About

This post covers common webhook integration failure modes and how to debug them faster without waiting through long retry cycles.

• •Silent drops occur when a server returns 200 OK but the handler never fires due to middleware filtering, routing issues, or swallowed database errors
• •Empty payloads are typically caused by API version mismatches between the endpoint and the event that generated it
• •Signature validation failures almost always stem from validating a parsed body instead of the raw request body, since Stripe computes signatures over the raw bytes
• •Infrastructure blocks (expired tunnels, firewall rules, crashed processes) cause delivery failures with no visibility into root cause
• •A webhook debugging proxy tool can capture raw payloads, inspect headers and timing, and replay events instantly to avoid Stripe's 1h/12h/72h retry schedule