public function initiateGuestCheckoutSessionAsyncWithHttpInfo($x_ebay_c_marketplace_id, $x_ebay_c_enduserctx = null, $create_guest_checkout_session_request_v2 = null)
    {
        $returnType = '\TNT\Ebay\Buy\Order\V2\Model\GuestCheckoutSessionResponseV2';
        $request = $this->initiateGuestCheckoutSessionRequest($x_ebay_c_marketplace_id, $x_ebay_c_enduserctx, $create_guest_checkout_session_request_v2);