How to expose this: SteamUser()->GetAuthSessionTicket() to BP?

// Fill out your copyright notice in the Description page of Project Settings.

#include "SteamAuthTest.h"
#include "OnlineSubsystem.h"
#include "MyCharacter.h"


// Sets default values
AMyCharacter::AMyCharacter()
{
 	// Set this character to call Tick() every frame.  You can turn this off to improve performance if you don't need it.
	PrimaryActorTick.bCanEverTick = true;

}

// Called when the game starts or when spawned
void AMyCharacter::BeginPlay()
{
	Super::BeginPlay();
	
}

// Called every frame
void AMyCharacter::Tick( float DeltaTime )
{
	Super::Tick( DeltaTime );

}

FString AMyCharacter::GetSessionTicket(class APlayerController* PlayerController)
{
	FString SessionTicket = iOnline->GetIdentityInterface()->GetAuthToken(int32 PlayerController);
	return SessionTicket;
}