Bulk set EDD Commissions to "unpaid" for all commissions after a specific date

edd-commission-update.php

<?php
$commissions = get_posts( array(
        'post_type' => 'edd_commission',
        'posts_per_page' => -1,
        'fields' => 'ids',
        'date_query' => array(
                'after' => array(
                        'year' => 2015,
                        'month' => 03,
                        'day' => 15
                ),
        ),
        'tax_query' => array(
                array(
                        'taxonomy' => 'edd_commission_status',
                        'terms' => 'paid',
                        'field' => 'slug'
                )
        )
) );
if( $commissions ) {

        foreach( $commissions as $c ) {
                eddc_set_commission_status( $c, 'unpaid' );
        }

}
echo 'done';

How to use this snippet?