WooCommerce custom add to cart buttons does not add products to cart if you’re logged out

To display specific products with their add-to-cart buttons on the homepage of a Wp site

you can use a shortcode to display specific products.

you can use the [display_specific_products ids="1,2,3"] shortcode in your home pages, or widgets to display the specified products with their add-to-cart buttons.

Replace 1,2,3 with the actual IDs of the products you want to display or change scenario as per your need.

// Add Shortcode
function display_specific_products_shortcode($atts) {
    // Extract shortcode attributes
    $atts = shortcode_atts(array(
        'ids' => '', // Comma-separated list of product IDs
    ), $atts);

    // Retrieve product IDs from shortcode attributes
    $product_ids = explode(',', $atts['ids']);

    // Initialize output variable
    $output="";

    // Loop through product IDs
    foreach ($product_ids as $product_id) {
        // Get product object
        $product = wc_get_product($product_id);

        // Check if product exists and is in stock
        if ($product && $product->is_in_stock()) {
            // Generate HTML output for product
            $output .= '<div class="product">';
            $output .= '<h2>' . $product->get_name() . '</h2>';
            $output .= '<img src="' . $product->get_image() . '" alt="' . $product->get_name() . '">';
            $output .= '<p>' . $product->get_price_html() . '</p>';
            $output .= '<form class="cart" action="' . esc_url(wc_get_cart_url()) . '" method="post" enctype="multipart/form-data">';
            $output .= '<input type="hidden" name="add-to-cart" value="' . esc_attr($product_id) . '">';
            $output .= '<button type="submit" class="button alt">' . __('Add to cart', 'woocommerce') . '</button>';
            $output .= '</form>';
            $output .= '</div>';
        }
    }

    // Return HTML output
    return $output;
}
add_shortcode('display_specific_products', 'display_specific_products_shortcode');