Stripe Webhook Verification Checklist

Verify Stripe webhook signatures, enforce idempotency, and avoid duplicate processing across retries.

Webhook hardening checklist

• Verify every event using Stripe signature headers and endpoint secret.
• Reject malformed or unsigned payloads before processing.
• Store event IDs and enforce idempotency to prevent duplicate effects.
• Scope webhook actions to known customers and expected metadata.
• Log failures with enough detail for replay and incident response.

Common failure mode

Teams often trust payload fields without first verifying the signature. That can let spoofed requests trigger billing or provisioning behavior.

Related: Rate Limiting Checklist and Next.js Security Checklist.