Building Reliable Webhook Pipelines for Third-Party APIs
Retry logic, signature verification and dead-letter queues for PayPal, Stripe, SMS and CRM integrations.
Mehran Shafique · May 14, 2026 · 1 min read · 81 words
Webhooks are distributed systems disguised as HTTP POSTs. Vendors retry; your handlers must be idempotent, fast and observable.
Verify signatures first
Reject unauthenticated payloads before touching database. Use constant-time comparison for HMAC secrets. Log verification failures separately from processing errors.
Respond quickly, process async
Return 200 after persisting raw payload to queue. Heavy work — PDF generation, CRM sync — belongs in workers. Timeouts cause duplicate deliveries.
Reconciliation jobs
Nightly cron compares vendor state with local records. Webhooks get lost. Polling backfill catches drift.
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