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Hidden byte errors are the most common cause of webhook signature failures

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Webhook signature verification often fails not because of a wrong secret, but due to invisible byte-level issues that are easy to overlook. One of the most frequent causes is framework re-serialization, where the server parses and reformats the raw request body, producing a different byte sequence and thus a different signature. Providers also differ significantly in their signing methods — Stripe prepends a timestamp, Slack uses a custom string prefix, and SendGrid uses ECDSA rather than HMAC entirely. Encoding mismatches are another common trap, as GitHub outputs hex while Shopify and WooCommerce use base64 for the same HMAC-SHA256 operation. A browser-based debugging tool called Hookden has been developed to help diagnose these issues locally without sending secrets over the network.

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Hidden byte errors are the most common cause of webhook signature failures · ShortSingh