leaky-paywall-renewal-email.php

<?php

/* two actions
leaky_paywall_stripe_invoice_payment_succeeded
leaky_paywall_stripe_payment_intent_succeeded
*/

add_action( 'leaky_paywall_stripe_invoice_payment_succeeded', 'zeen_send_renewal_email_notification', 10, 2 );

function zeen_send_renewal_email_notification( $user, $stripe_object ) {
    
    $to = 'admin@example.com';
    $subject = 'Renewal Payment Notification';
    $body = 'A renewal payment succeeded for' . $user->user_email;
    $headers = array('Content-Type: text/html; charset=UTF-8','From: My Site Name <support@example.com');
     
    wp_mail( $to, $subject, $body, $headers );
}