# Headers

In all requests for all types three headers will be sent:

<table><thead><tr><th width="186">Attribute</th><th width="536">Description</th></tr></thead><tbody><tr><td><code>timestamp</code></td><td>The unix time stamp</td></tr><tr><td><code>operator-name</code></td><td>Operator name</td></tr><tr><td><code>signature</code></td><td>Signature of incoming request body and secret key (HMAC)</td></tr></tbody></table>

By checking signature in request you may confirm that the notification came from us.

Detailed info about how to calculate signature may be found on [Signature](/sms-notifications/signature.md) page.


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# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://developer.betstack.io/sms-notifications/headers.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.