> For the complete documentation index, see [llms.txt](https://emca.emudhra.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://emca.emudhra.com/integrating-emca/rest-api-support/esign.md).

# eSign

## Prerequisites

Register once to obtain a unique ID used for all API authentications. The ID is derived from your system ID and email supplied at registration. All requests must use HTTPS (TLS 1.2+).

## Registration

Provide the following KYC details: full name, state, location, country, email, organisation, organisation unit, mobile, and system ID.\
**Mandatory:** full name, email, and system ID.

After approval, generate your **unique ID** as:\
`<systemID><email>`

{% hint style="info" %}
Example: system ID `LOREM-IPSUM`, email `abc@xyz.com` → unique ID `LOREM-IPSUMabc@xyz.com`.
{% endhint %}

This unique ID is required for all eSign API calls.

## Authentication

eSign APIs authenticate each request with the **unique ID** created during registration.\
Include the unique ID in every call (header or field as defined in the API reference).\
Use the exact value and casing; treat the ID as sensitive configuration, not client visible.

## eSign APIs Documentation

All APIs related to user registration, signing document hash, getting certificate chain and user KYC status:

* keygen/csr
* signing/sign
* getCertificateChain
* getKYCStatus

## eSign Postman Link:

* [eSign](https://documenter.getpostman.com/view/28084851/2sA3e1CAqy)


---

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