Stripe webhook signature verification failed: the 5 causes and fixes
If you've integrated Stripe webhooks, you've probably seen this error: StripeSignatureVerificationError: No signatures found matching the expected signature for payload. Are you passing the raw request body you received from Stripe? The error message is accurate but doesn't say much. Below are the five causes I see most often, in order of how common they are, with a fix for each. How the…
If you have integrated Stripe webhooks, you might have encountered this error: StripeSignatureVerificationError: No signatures found matching the expected signature for payload. While the error message provides information, it doesn't offer much clarity. Below are the five most common causes of this issue, ranked by frequency, along with solutions for each.
To understand how the signature verification process works, you should know that every webhook request contains a Stripe-Signature header, which contains three elements: a timestamp (t), a version (v1), and the actual signature. Stripe calculates v1 as an HMAC-SHA256 of the string {t}.{raw_body}, using your endpoint's signing secret (whsec_...) as the key.
Your application recomputes v1 on its side and compares it with the value provided in the header. Verification will only succeed if all three elements match exactly what Stripe used: the raw body bytes, the signing secret, and a timestamp within a 5-minute tolerance window. Any discrepancy in these three elements will result in the signature verification failure.
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