# tys.webhooks.generateTestHeader()

> Builds a valid TYS-Signature header for a payload, to test your webhook handler.

Source: https://docs.tryyoursize.com/reference/node/webhooks-generate-test-header/

*Method* · `@tryyoursize/node`

Builds a valid `TYS-Signature` header for a payload, to test your webhook handler.

```ts
generateTestHeader(opts: Parameters<typeof generateTestHeader>[0]): string
```

## Parameters

- **`opts`** (`Parameters<typeof generateTestHeader>[0]`, required): `{ payload, secret, timestamp? }`: the body, the secret (or several, as during a rotation) and the unix time (default now).

## Returns

`string`: The header value: `t=<unix>,v1=<hex>`.

## Example

**Node.js**

```ts
const payload = JSON.stringify({ id: "evt_test", object: "event", type: "webhook.test", data: {} });
const header = tys.webhooks.generateTestHeader({ payload, secret: "whsec_test" });
await fetch("http://localhost:3000/webhooks/tryyoursize", {
  method: "POST",
  headers: { "TYS-Signature": header, "Content-Type": "application/json" },
  body: payload,
});
```

**Python**

```python
payload = json.dumps({"id": "evt_test", "object": "event", "type": "webhook.test", "data": {}})
header = tryyoursize.Webhook.generate_test_header(payload, "whsec_test")
```