Delete User on PMPro Approvals Deny. Delete denied user.

pmpro-approvals-delete-deny.php

<?php
/**
 * Automatically delete user when their approval is denied.
 * Add this code to your site by following: https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */
 function pmpro_approvals_delete_member_on_deny( $user_id, $level_id ) {
	wp_delete_user( $user_id );
}
add_action( 'pmpro_approvals_after_deny_member', 'pmpro_approvals_delete_member_on_deny', 10, 2 );