---
title: 5.8 Sign document with OTP
description: "Among the handwritten signature, another way how to sign document is via OTP. OTP can be sent via: - E-mail - *openOtpEmail* - SMS – *openOtpPhone*(signature request package with SMS addon is requested) OTP is sent to the email or…"
url: "https://wiki.signatus.com/documentation/okdokument-api/5-7-sign-document-with-otp/"
updated: "2025-03-21"
category: 5. Configuration of the signing process
---

# 5.8 Sign document with OTP

Among the handwritten signature, another way how to sign document is via OTP. OTP can be sent via:

- E-mail - *openOtpEmail*
- SMS – *openOtpPhone*(signature request package with SMS addon is requested)

OTP is sent to the email or telephone number after opening the signature acrofield.

**Note**: OTP signature requires signature acrofield and disabled signAnywhere function (*signAnywhereEnabled-false*). Its recommended to use allowedFields and enable only one signature acrofield.

![](http://172.21.34.68/wp-content/uploads/2024/06/image-19.png)
Figure 23 Sign via OTP

```
{
   "rules": {
        "signOtpEmail": "email@adress.com",
        "signAnywhereEnabled": false
    },
   "allowedFields":{"SIGNATURE":"_SO1_"},
   "filedata": {
        "content": "xyz_JVBERi0xLjc=="
    }
}
```