Sends custom email notifications for WooCommerce subscription status changes from on-hold to active and pending-cancel to active.

woocommerce-subscription-email-notifications.php

<?php
// Hook for reactivation from 'on-hold' to 'active'
add_action('woocommerce_subscription_status_on-hold_to_active', 'send_custom_email_on_reactivation', 10, 1);

function send_custom_email_on_reactivation($subscription) {
    $user_email = $subscription->get_billing_email();

    // Optional: Check if this is an admin reactivation
    if (is_admin() && current_user_can('manage_woocommerce')) {
        $action = 'admin reactivated';
    } else {
        $action = 'reactivated';
    }

    send_custom_email($user_email, $action);
}

function send_custom_email($to, $action) {
    $subject = 'Subscription ' . $action;
    $message = 'Your subscription has been ' . $action . '.';
    $headers = array('Content-Type: text/html; charset=UTF-8');
    
    wp_mail($to, $subject, $message, $headers);
}

add_action('woocommerce_subscription_status_updated', 'check_specific_status_transitions', 10, 3);

function check_specific_status_transitions($subscription, $new_status, $old_status) {
    if ($old_status === 'pending-cancel' && $new_status === 'active') {
        send_custom_email_on_reactivation($subscription);
    }
}