void Checkout ( const [FUniqueNetId](API\Runtime\CoreOnline\Online\FUniqueNetId) & UserId, const [FPurchaseCheckoutRequest](API\Plugins\OnlineSubsystem\Interfaces\FPurchaseCheckoutRequest) & CheckoutRequest, const [FOnPurchaseReceiptlessCheckoutComplete](API\Plugins\OnlineSubsystem\Interfaces\FOnPurchaseReceiptlessCheckoutCo-) & Delegate )