Dev Tools · 1h ago
Square Webhook Signature Verification: Avoid the Notification-URL Trap
Square's webhook signatures include the notification URL in the HMAC, not just the body. Developers must use the exact URL and raw body to validate, or verification fails silently. The post details the correct scheme and common pitfalls like URL mismatch and parsing before verification.
Meridian48 take
This is a niche but critical gotcha for developers integrating Square payments; the same pattern applies to Stripe and others, making it a useful reference for backend teams.
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How to Verify Square Webhook Signatures (and the Notification-URL Trap) →
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