public function addToCart(array $args, array $payload) {
        global $usces;

        $echeck = $this->canAddToCart($args);
        if ($echeck instanceof GenericError) {
            return $echeck;
        }

        $id = (int)$args['itemId'];
        $item = CRUD::getWishlistItemById($id);
        $serial = $item['serial'];
        if (!isset($_SESSION['usces_cart'][$serial])) {
            $_SESSION['usces_cart'][$serial]['quant'] = (int)$item['quantity'];
            $_SESSION['usces_cart'][$serial]['advance'] = (string)$item['advance'];
            $unit_price = null;
            // `get_realprice` uses `$this->serial` internally so we need to update it here
            $usces->cart->serial = $serial;
            $price = $usces->cart->get_realprice(
                $item['postId'],
                $item['sku'],
                (int)$item['quantity'],
                null,
                $unit_price
            );
            $_SESSION['usces_cart'][$serial]['price'] = $price;
            $_SESSION['usces_cart'][$serial]['unit_price'] = $unit_price;
            if (!empty($item['advance'])) {
                $_SESSION['usces_cart'][$serial]['advance'] = $usces->cart->wc_serialize((string)$item['advance']);
            }
        }

        /**
         * Fires after adding an item from the wishlist to the cart.
         *
         * @important
         * @param \Aivec\Welcart\Extensions\Wishlist\API\Wishlist $this Instance of the `Wishlist` API class
         * @param array                                           $args See \Aivec\Welcart\Extensions\Wishlist\API\Wishlist::addToCart()
         *                                                              for details
         * @param array                                           $payload See \Aivec\Welcart\Extensions\Wishlist\API\Wishlist::addToCart()
         *                                                                 for details
         */
        do_action('wcexwl_wishlist_api_add_to_cart_on_complete', $this, $args, $payload);

        return CRUD::getAndBuildWishlistItems();
    }