WooCommerce Customer/Order CSV Export: Add additional columns

woocommerce-customer-order-csv-export-add-additional-columns.php

<?php
// add custom column headers
function wc_csv_export_modify_column_headers( $column_headers ) { 
 
	$new_headers = array(
		'column_1' => 'Column 1',
		'column_2' => 'Column 2',
		// add other column headers here in the format column_key => Column Name
	);
 
	return array_merge( $column_headers, $new_headers );
}
add_filter( 'wc_customer_order_csv_export_order_headers', 'wc_csv_export_modify_column_headers' );

// set the data for each for custom columns
function wc_csv_export_modify_row_data( $order_data, $order ) {
 
	$custom_data = array(
		'column_1' => get_post_meta( $order->id, 'some_meta_key', true ),
		'column_2' => get_post_meta( $order->id, 'some_other_meta_key', true ),
		// add other row data here in the format column_key => data
	);
 
	return array_merge( $order_data, $custom_data );
}
add_filter( 'wc_customer_order_csv_export_order_row', 'wc_csv_export_modify_row_data', 10, 2 );

@mikeeman2000, did you ever figure that out? I'm looking to do the same.