Delete All WooCommerce Subscriptions

delete_all_woocommerce_subscriptions.php

<?php
/*
Plugin Name: Delete All Subscriptions
Plugin URI:
Description: Delete all of those bad boys
Author:
Author URI:
Version: 1.0
*/
function mystic_delete_all_subscriptions() {

	$subscriptions = WC_Subscriptions::get_subscriptions(
		array(
			'subscriptions_per_page' => 1000,
		)
	);

	foreach( $subscriptions as $subscription ) {
		WC_Subscriptions_Manager::delete_subscription( $subscription['user_id'], $subscription['subscription_id'] );
	}

}
add_action( 'admin_footer', 'mystic_delete_all_subscriptions' );

function mystic_force_delete_subscription( $subscription_can_be_changed, $subscription ) {
	return true;
}
add_filter( 'woocommerce_subscription_can_be_changed_to_deleted', 'mystic_force_delete_subscription', 10, 2 );

Simply deleting a post using wp_delete_post doesn't send anything. And even if you uncomment the subscription status change as shown in my version of the script, by default, there is no customer email that is sent when a subscription gets cancelled. You would have to add a line there that sends a custom email to the customer.