---
title: "signature_invalid error"
url: "https://lookvalid.com/docs/errors/signature_invalid.md"
canonical_url: "https://lookvalid.com/docs/errors/signature_invalid"
last_updated: "2026-10-22"
type: "reference"
summary: "HTTP 400 signature_invalid: The request signature is missing or does not match. Cause, fix and a curl example."
related: ["https://lookvalid.com/docs/errors.md", "https://lookvalid.com/docs/credits-and-billing.md"]
---

# signature_invalid error

HTTP 400 signature_invalid: The request signature is missing or does not match. Cause, fix and a curl example.

`signature_invalid` is returned with HTTP **400**. Retryable: no. Sending the same request again returns the same error. Nothing is charged for this error.

## What it means

The request signature is missing or does not match.

## Most likely cause

Only the Stripe webhook endpoint returns this. The request has no `Stripe-Signature` header, or the signature was made with a different signing secret or over a body that changed on the way.

## How to fix it

Sign the exact raw request body with the signing secret this server was given and send the signature header.

## Example

Stripe signs its own deliveries; you never call this endpoint yourself. A request without a `Stripe-Signature` header is refused with HTTP 400 and nothing is recorded.

```sh
curl -i -X POST https://YOUR_API_HOST/v1/billing/webhook -H "Content-Type: application/json" -d '{}'
```

An error response is one JSON envelope. Branch on `code`, never on the message text. The `message` and `fix` of a real response can be more specific than the defaults shown here.

```json
{
  "error": {
    "code": "signature_invalid",
    "message": "The request signature is missing or does not match.",
    "fix": "Sign the exact raw request body with the signing secret this server was given and send the signature header.",
    "docs_url": "https://lookvalid.com/docs/errors/signature_invalid",
    "retryable": false,
    "request_id": "req_3fK9pQ2xVb7LmN4sTz8WcA"
  }
}
```

## See also

- [All error codes](https://lookvalid.com/docs/errors.md) with the response envelope.
- [Credits and billing](https://lookvalid.com/docs/credits-and-billing.md).
- Quote the `request_id` when you write to [hello@lookvalid.com](mailto:hello@lookvalid.com).

## Related

- [Errors](https://lookvalid.com/docs/errors.md)
- [Credits and billing](https://lookvalid.com/docs/credits-and-billing.md)