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Multi-Vendor Webhook Foundation
Several third-party providers — identity, e-signature, background checks — each
push status updates via webhooks with different payloads, signing schemes, and
retry behavior. Ad-hoc handlers meant duplicated verification logic and
inconsistent failure handling.
I built a shared foundation handling signature verification, replay protection,
idempotency, and dead-letter capture, with per-vendor adapters extending the base
rather than forking it. Adding a provider became an adapter, not a subsystem.
Verification is fail-closed: an unverifiable webhook is rejected outright, never
processed on the assumption it's probably genuine. A reconciliation job covers
the case where a webhook never arrives at all.
The network for creativity
Join 1.25M professional creatives like you
Connect with clients, get discovered, and run your business 100% commission-free
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