[android-components](../../index.md) / [mozilla.components.service.fxa.manager](../index.md) / [FxaAccountManager](index.md) / [beginAuthenticationAsync](./begin-authentication-async.md)

# beginAuthenticationAsync

`fun beginAuthenticationAsync(pairingUrl: `[`String`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html)`? = null): Deferred<`[`String`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html)`?>` [(source)](https://github.com/mozilla-mobile/android-components/blob/master/components/service/firefox-accounts/src/main/java/mozilla/components/service/fxa/manager/FxaAccountManager.kt#L449)