---
title: "Create signature"
method: POST
path: "/v1/clients/{clientId}/signatures"
tags: ["Qualified Electronic Signature"]
---

# Create signature

`POST /v1/clients/{clientId}/signatures`

Use this endpoint to create a signature, including its metadata and the document(s) to be signed. <br /><br /><img src="https://files.readme.io/310d4d3-Inline_Caution.svg" align="left" alt="Important" /> **Important:** <code>signatureId</code> and <code>workflowId</code> are string identifiers that can be used interchangeably.

## Path parameters

- `clientId` string, required

## Headers

- `Authorization` string, required — The `access_token` returned in your most recent [Create access token](https://docs.fourthline.com/reference/create-access-token) response.
- `Content-Type` string

## Response `202`

The signature was created

- object
  - `SignatureId` string, uuid, required

## Other responses

- `400` — The request did not match the specification or a required parameter was missing
- `404` — The provided `clientId` was not found in the system

---

[API](https://skmtc.net/fourthline/apis/fourthline-apis.md) · [All operations](https://skmtc.net/fourthline/apis/fourthline-apis/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/fourthline/fourthline-apis/revisions/7991ae7c8383/schema)