# 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. |