Send email to user when removed from a group account via the Manage Group page

my_pmpro_group_account_removal_notification.php

<?php
/**
 * Send email to user when removed from a group account via the Manage Group page
 *
 * You can add this recipe to your site by creating a custom plugin
 * or using the Code Snippets plugin available for free in the WordPress repository.
 * Read this companion article for step-by-step directions on either method.
 * https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */
 
 function my_pmpro_group_account_removal_notification( $level_id, $user_id, $cancel_level_id ) {
	if ( ! empty( $_REQUEST['pmprogroupacct_remove_group_members'] ) ) {

		$site_title = get_bloginfo( 'name' );
		$cancel_level = pmpro_getLevel( $cancel_level_id );
		$user = get_user_by( 'id', $user_id );

		$to = $user->user_email;
		$subject = 'Group membership on ' . $site_title . ' ended';
		$message = 'Hi ' .$user->display_name . ',<br><br>Your ' . $cancel_level->name . ' group membership has been removed.';
	
		wp_mail( $to, $subject, $message);
	}
}
add_action( 'pmpro_after_change_membership_level', 'my_pmpro_group_account_removal_notification', 10, 3 );