---
title: "OIDC Federation support for your iOS app"
slug: "dpo-ios-app-sdk-oidc-federation-support"
updated: 2026-10-27T19:39:11Z
published: 2026-10-27T19:39:11Z
canonical: "docs.onespan.com/dpo-ios-app-sdk-oidc-federation-support"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.onespan.com/llms.txt
> Use this file to discover all available pages before exploring further.

# OIDC Federation support for your iOS app

The App SDK provides an interface to integrate FIDO authentication into an existing OIDC Federation infrastructure. Use this interface as an OIDC Federation client. After an end user authenticates and your app receives the AuthenticationData object from the App SDK, initiate the OIDC flow:

```swift
if let jwt = (authData?.sessionData.object(forKey: "sessionKey")) {
    let params = NNLOidcFederationParams(authFlow: URL(string: "<OIDC_AUTH_URL>"), jwToken: jwt)
    params.federationResumeUrl = URL(string: "<OIDC_RESUME_URL>")
    params.tokenUrl = URL(string: "<OIDC_TOKEN_URL>")
    let fedClient = NNLOidcFederationClient(params: params)
    let promise = fedClient.performCodeGrantFlow()
    promise.then({ result in
        if let result = result as? NNLOidcResult {
            print("ID Token = \(result.id_token ?? "nil")")
            print("Refresh Token = \(result.refresh_token ?? "nil")")
            return NSNull()
        }).error({ error in
            print("Code grant flow operation failed with an error. Reason: \((error as? NSError)?.localizedDescription ?? "unknown")")
            return NSNull()
        })
    }
}
```

Class NNLOidcFederationClient contains methods that support the following OIDC flows:

- Authorization code grant
- Implicit
- Token refresh

Working example in Tutorial App

- AppDelegate.swift shows how to initiate OIDC flows.