add product_cat meta key

Hello,

I tried to add the product category field by editing the plugin. I’ve used the meta key product_cat. This field has been added to settings but doesn’t come out in the csv file.

this is the code I’ve added to the function.php. am i doing something wrong? can you help?

function wpg_add_columns($cols) {

$cols[‘wc_settings_tab_product_cat’] = __(‘Product category’, ‘mytheme’);
return $cols;
}
add_filter(‘wpg_order_columns’, ‘wpg_add_columns’);

function wpg_add_fields($settings) {

$settings[‘product_cat’] = array(
‘name’ => __( ‘Product category’, ‘woocommerce-simply-order-export’ ),
‘type’ => ‘checkbox’,
‘desc’ => __( ‘Product category’, ‘woocommerce-simply-order-export’ ),
‘id’ => ‘wc_settings_tab_product_cat’
);

return $settings;

}
add_filter(‘wc_settings_tab_order_export’, ‘wpg_add_fields’);

function csv_write( &$csv, $od, $fields ) {

if( !empty( $fields[‘wc_settings_tab_product_cat’] ) && $fields[‘wc_settings_tab_product_cat’] === true ){
$product_cat = get_post_meta( $od->id, ‘_product_cat_title’, true );
array_push( $csv, $product_cat );
}

}
add_action(‘wpg_before_csv_write’, ‘csv_write’, 10, 3);