---
title: "Send Signing Request"
method: POST
path: "/signature_link/send_signing_request"
tags: ["Document AI — E-Signatures"]
---

# Send Signing Request

`POST /signature_link/send_signing_request`

## Request

- Base URL: `https://api.paperoffice.ai/latest`
- URL: `https://api.paperoffice.ai/latest/signature_link/send_signing_request`
- Auth: HTTP bearer

Send a signature-link invitation for an existing signing request.

## Request body

- object
  - `request_id` string, required: Signature request ID
  - `signers` object[]: Optional. New signers to add and invite (name, email, phone). Omit to invite all pending signers already on request_id.
  - `message` string: Message to the signer
  - `channel` 'email' | 'manual' | 'none': Invitation delivery: email (default) sends the invitation email; manual or none only returns the signing URL for the user to pass on. The signer receives the SMS one-time code on the signing page.

## Response `200`

Success

- object: Unterschriftsanfrage per Link senden
  - `status` 'success' | 'error', required: HTTP-Level Status
  - `job_id` string, required
  - `message` string: Menschenlesbare Statusmeldung
  - `pipeline` string
  - `operation` string: Ausgefuehrte Operation
  - `processing_time` string: Gesamte Verarbeitungszeit inkl. Queue (Format: 123.45ms)
  - `result` object, required: Das eigentliche Verarbeitungsergebnis
    - `status` 'completed' | 'failed' | 'timeout': Job-Level Status
    - `message` string: Pipeline-spezifische Statusmeldung
    - `duration_ms` string: Reine Pipeline-Verarbeitungszeit in ms
    - `output` object
      - `request_id` string
      - `signing_url` string, uri
      - `status` string

## Other responses

- `4XX`: Error
- `5XX`: Error

---

[API](https://skmtc.dev/paperoffice/apis/paperoffice-ai-api.md) · [All operations](https://skmtc.dev/paperoffice/apis/paperoffice-ai-api/llms.txt) · [OpenAPI document](https://skmtc.dev/paperoffice/apis/paperoffice-ai-api/revisions/c6a6228a4509?raw)