Checkout: Filter - checkout_admin_orders_export_headings Example

gistfile1.php

<?php

function orders_export_headings($headings = null, $data = null) {

    //remove the 'paid' column
    unset($headings['paid']);
    
    //add a custom column
    $headings['custom'] = "My Column";

    return $headings;
}

add_filter('checkout_admin_orders_export_headings', 'orders_export_headings', 10, 2);

?>