---
title: "Nonce"
canonical: "https://openfinanceguide.com/en/stet/1.6.3/resources/nonce"
edition: "STET PSD2 API 1.6.3.1"
source: "https://openfinanceguide.com/docs/stet/1.6.3/pdf/api-dsp2-stet-v1.6.3.2-openapi.yaml"
pdf: "https://openfinanceguide.com/docs/stet/1.6.3/pdf/api-dsp2-stet-v1.6.3.1-part-2-functional-model.pdf"
language: "en"
normative: "The normative text is the English PDF and OpenAPI file published by STET. This Markdown reproduces it for reading; where they differ, the PDF prevails."
license: "CC BY 3.0 FR (https://creativecommons.org/licenses/by/3.0/fr/), STET. Converted to Markdown by Open Finance Guide."
---

# Nonce

Type: `string` · Kind: Resources · Constraints: maxLength 70

Challenge to be sent in order to avoid replay of the authentication process.

## Example

```json
"string"
```

## Used by

- `POST /payment-requests/{paymentRequestResourceId}/confirmation` (paymentRequestConfirmationPost)
- `PUT /payment-requests/{paymentRequestResourceId}` (paymentRequestPut)
- `POST /payment-requests` (paymentRequestsPost)