# Introduction

The purpose of **SIGNIUS PROFESSIONIAL** platform is eIDAS-compliant electronic signing, where eIDAS stands for "electronic IDentification, Authentication and trust Services", and it is the EU regulation on digital services.

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Our **SIGNIUS API** is primarily used to delegate a document for electronic signing.

**SIGNIUS API User guide** will easily introduce you with the functionalities of **SIGNIUS PROFESIONAL** platfor&#x6D;**.**

It was written in a comprehensible manner to describe all actions related to document and signees management.

Our Application Programming Interface is a REST-type API. It has predictable resource-oriented URLs, accepts [JSON-encoded](https://www.json.org/json-en.html) request bodies, returns JSON-encoded responses and uses standard HTTP response codes and verbs.

**SIGNIUS API** is rapidly evolving, but we always provide backwards compatibility.