modification-for-pro-export-helper.php

foreach ( $_order->order_items as $key => $item ) { 
		
	$product_id = ( version_compare( WC_VERSION, '2.7', '<' ) ) ? !empty( $item['variation_id'] ) ? $item['variation_id'] : $item['product_id'] : $item->get_product_id(); 
	$_product = new WC_Product( $product_id );

	$needs_shipping 	= $_product->is_virtual(); 
	if ( !$needs_shipping ) $needs_shipping = 0; 

	$downloadable 		= ( $_product->is_downloadable( 'yes' ) ) ?  true: false; 
	if ( $downloadable == null )  $downloadable = 0; 
	$item_qty 		= $item['qty']; 
	$item_name		= $item['name']; 
	$products 		.= "$item_qty x $item_name \r"; 
	$needs_to_ship 	= ( $needs_shipping || !$downloadable ) ? true : false;
                    
        if ( ! empty( $item[ 'item_meta_array' ] ) ) {
							
		foreach ( $item[ 'item_meta_array' ] as $meta ) { 

			// Skip hidden core fields
			if ( in_array( $meta->key, apply_filters( 'woocommerce_hidden_order_itemmeta', array(
				'_qty',
				'_tax_class',
				'_product_id',
				'_variation_id',
				'_line_subtotal',
				'_line_subtotal_tax',
				'_line_total',
				'_line_tax',
				'method_id', 
				'cost', 
				'_commission_total', 
				'is_wpsls_software', 
				WC_Vendors::$pv_options->get_option( 'sold_by_label' ), 
			) ) ) ) {
				continue;
			}
				// Skip serialised meta
			if ( is_serialized( $meta->value ) ) {
				continue;
			}

			// Get attribute data
			if ( taxonomy_exists( wc_sanitize_taxonomy_name( $meta->key ) ) ) {
				$term           = get_term_by( 'slug', $meta->value, wc_sanitize_taxonomy_name( $meta->key ) );
				$meta->key  	= wc_attribute_label( wc_sanitize_taxonomy_name( $meta->key ) );
				$meta->value 	= isset( $term->name ) ? $term->name : $meta->value;
			} else {
				$meta->key   	= apply_filters( 'woocommerce_attribute_label', wc_attribute_label( $meta->key, $_product ), $meta->key );
			}
                             
                        $products .= wp_kses_post( rawurldecode( $meta->key ) ) . ': ' . wp_kses_post( rawurldecode( $meta->value ) ) . ' | ';
		}
	}
}