Maxim Mironjuk
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January 01, 2026
A webhook endpoint differs fundamentally from a classic REST API you call yourself, because you control neither the timing nor the frequency of incoming delivery and must either trust the sender initially or verify its identity cryptographically. Anyone who overlooks these quirks during design almost inevitably builds in a gap, whether that's an unchecked signature, a payment processed twice, or an endpoint that simply drops events under load. This article shows how Claude helps with a robust design of signature checking, idempotency, and provider specific retry behavior.