# Signature

The Signature component of the Authorization header is an **HMAC-SHA256** digest of the elements described below<br>

| Element      | Description                                                                                                                                                                       |
| ------------ | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Request URI  | Everything after the base URL, including query parameters if present.                                                                                                             |
| Timestamp    | Current [UNIX epoch time ](https://www.unixtimestamp.com/)in milliseconds                                                                                                         |
| Request body | A [minified ](https://codebeautify.org/jsonminifier)**JSON**-serialized string of the request body. If a body is not required (e.g. request is of type GET), use an empty string. |


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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://docs.finrax.com/authorization/signature.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.