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Tools/Webhook Signature Verifier
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Webhook Signature Verifier
Verify webhook signatures from Stripe, Adyen, Checkout.com, and Braintree. Confirms a payload was signed with your secret and hasn't been tampered with — all HMAC runs in your browser, nothing is sent anywhere.
Stripe signs the raw body prefixed with a timestamp. Paste the full Stripe-Signature header value (t=…,v1=…) below.
⚠ Use the raw request body exactly as received — re-serializing JSON changes the bytes and breaks the signature.
How Stripe signs webhooks
signed_payload = "{timestamp}.{raw_body}"
expected = HMAC_SHA256(signed_payload, whsec_secret) // hex
compare expected to the v1 value in the Stripe-Signature header.
Also reject if |now - timestamp| exceeds your tolerance (default 300s).