> For the complete documentation index, see [llms.txt](https://docs.developer.singpass.gov.sg/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.developer.singpass.gov.sg/docs/client-initiated-backchannel-authentication-ciba/step-up-authentication-using-push-notifications.md).
# Step-up Authentication using Push Notifications
{% hint style="warning" %}
Onboarding for CIBA is only for Government agencies and on a case-by-case basis.
{% endhint %}
## Introduction
This guide illustrates the Step-up Authentication (Push Notifications) Flow and the APIs that Relying Parties (RP) need to integrate with.
The Step-up authentication feature can be employed in use-cases where RPs require their users to perform an additional layer of authentication before proceeding on with a **high-risk transaction**. This kind of authentication is done by triggering a push notification to the user’s Singpass Mobile Application.
RPs who are looking to opt-in for Step-up Authentication are required to integrate with Singpass operating in the **Client-initiated Backchannel Authentication (CIBA) Poll Mode** (see [CIBA specs](https://openid.net/specs/openid-client-initiated-backchannel-authentication-core-1_0.html#rfc.section.7)). Refer to this diagram for an overview of the CIBA authentication flow between an RP, Singpass and its dependencies.
CIBA Authentication Flow between RP, Singpass and its dependencies
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