{
        if (isset($_POST['_unit'])) {
            update_post_meta($post_id, '_unit', sanitize_text_field($_POST['_unit']));
        }
        if (isset($_POST['_unit_base'])) {
            update_post_meta($post_id, '_unit_base', $_POST['_unit_base'] === '' ? '' : wc_format_decimal($_POST['_unit_base']));
        }
        if (isset($_POST['_unit_price_regular'])) {
            update_post_meta($post_id, '_unit_price_regular', $_POST['_unit_price_regular'] === '' ? '' : wc_format_decimal($_POST['_unit_price_regular']));
            update_post_meta($post_id, '_unit_price', $_POST['_unit_price_regular'] === '' ? '' : wc_format_decimal($_POST['_unit_price_regular']));
        }
        if (isset($_POST['_unit_price_sale'])) {
            update_post_meta($post_id, '_unit_price_sale', '');
            // Update Sale Price only if is on sale (Cron?!)
            if (get_post_meta($post_id, '_price', true) != $_POST['_regular_price'] && $_POST['_unit_price_sale'] !== '') {
                update_post_meta($post_id, '_unit_price_sale', $_POST['_unit_price_sale'] === '' ? '' : wc_format_decimal($_POST['_unit_price_sale']));
                update_post_meta($post_id, '_unit_price', $_POST['_unit_price_sale'] === '' ? '' : wc_format_decimal($_POST['_unit_price_sale']));
            }
        }
        if (isset($_POST['_mini_desc'])) {
            update_post_meta($post_id, '_mini_desc', esc_html($_POST['_mini_desc']));
        }
        if (isset($_POST['delivery_time']) && !is_numeric($_POST['delivery_time'])) {
            wp_set_post_terms($post_id, sanitize_text_field($_POST['delivery_time']), 'product_delivery_time');
        } else {
            wp_set_object_terms($post_id, absint($_POST['delivery_time']), 'product_delivery_time');
        }
    }
}
WC_Germanized_Meta_Box_Product_Data::init();
 public static function save($variation_id, $i)
 {
     $data = array('_unit' => '', '_unit_base' => '', '_unit_product' => '', '_unit_price_auto' => '', '_unit_price_regular' => '', '_unit_price_sale' => '', '_mini_desc' => '', 'delivery_time' => '');
     foreach ($data as $k => $v) {
         $data_k = 'variable' . (substr($k, 0, 1) === '_' ? '' : '_') . $k;
         $data[$k] = isset($_POST[$data_k][$i]) ? $_POST[$data_k][$i] : null;
     }
     $product = wc_get_product($variation_id);
     $data['product-type'] = isset($product->parent) ? $product->parent->product_type : $product->type;
     $data['_sale_price_dates_from'] = $_POST['variable_sale_price_dates_from'][$i];
     $data['_sale_price_dates_to'] = $_POST['variable_sale_price_dates_to'][$i];
     $data['_sale_price'] = $_POST['variable_sale_price'][$i];
     WC_Germanized_Meta_Box_Product_Data::save_product_data($variation_id, $data, true);
 }
 private function import_single_product_data($product)
 {
     $save = array('product-type' => $product->get_type(), '_unit_price_sale' => '', '_unit_price_regular' => '');
     // Price per unit
     if (get_post_meta($product->id, '_regular_price_per_unit', true)) {
         $regular = get_post_meta($product->id, '_regular_price_per_unit', true);
         $base = get_post_meta($product->id, '_unit_regular_price_per_unit_mult', true);
         $sale = get_post_meta($product->id, '_sale_price_per_unit', true);
         $unit = get_post_meta($product->id, '_unit_regular_price_per_unit', true);
         if ($unit) {
             $unit_term = get_term_by('slug', $unit, $this->taxonomies['product_unit']);
             if ($unit_term && !is_wp_error($unit_term)) {
                 $gzd_term = false;
                 if (!($gzd_term = get_term_by('slug', $unit, 'product_unit'))) {
                     $gzd_term = wp_insert_term($unit_term->name, 'product_unit', array('description' => $unit_term->description));
                 }
                 if ($gzd_term && !is_wp_error($gzd_term)) {
                     $save['_unit'] = $gzd_term->slug;
                     $save['_unit_base'] = $base;
                     $save['_unit_price_regular'] = $regular;
                     $save['_unit_price_sale'] = $sale;
                     $save['_sale_price'] = $product->get_sale_price();
                     $save['_sale_price_dates_from'] = get_post_meta($product->id, '_sale_price_dates_from', true) ? get_post_meta($product->id, '_sale_price_dates_from', true) : '';
                     $save['_sale_price_dates_to'] = get_post_meta($product->id, '_sale_price_dates_to', true) ? get_post_meta($product->id, '_sale_price_dates_to', true) : '';
                 }
             }
         }
     }
     // Delivery time
     if ($delivery_time = get_post_meta($product->id, '_lieferzeit', true)) {
         $term = get_term_by('id', $delivery_time, $this->taxonomies['product_delivery_time']);
         if ($term && !is_wp_error($term)) {
             $save['delivery_time'] = $term->name;
         }
     }
     // Free shipping
     if ('on' === get_post_meta($product->id, '_suppress_shipping_notice', true) && !$product->is_type('variation')) {
         $save['_free_shipping'] = 'yes';
     }
     // Save
     if (sizeof($save) > 3) {
         WC_Germanized_Meta_Box_Product_Data::save_product_data($product->id, $save, $product->is_type('variation'));
     }
 }