MainScreen.kt

val localActivity = LocalActivity.current

...

// Get the authentication request JSON from the server, using the code above
val authenticationRequestJson = getPasskeyAuthenticationRequestJson(username)

// Build the request for Credential Manager
val getPublicKeyCredentialOption = GetPublicKeyCredentialOption(
    requestJson = authenticationRequestJson
)
val signInRequest = GetCredentialRequest(listOf(getPublicKeyCredentialOption))

// Ask Credential Manager to process the sign-in request
// This will pop up a dialog asking the user for their biometrics or PIN
// (hence the need to pass in the activity)
val result = credentialManager.getCredential(
    context = localActivity,
    request = signInRequest
)

val credential = result.credential

// Check that the returned credential is a passkey (PublicKeyCredential)
if (credential !is PublicKeyCredential) {
    throw Exception("Incorrect credential type")
}