post auditlog implementation for bookings and payments

src/processors/process_application.php

@@ -221,6 +221,10 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
                 // Optionally send an invoice referencing the internal payment id
                 // sendInvoice(getEmail($user_id), getFullName($user_id), $payment_id, formatCurrency($payment_amount), $description);
                 // sendAdminNotification('4WDCSA.co.za - New Membership Application - '.$last_name , 'A new member has signed up, '.$first_name.' '.$last_name);
+                // Audit: membership application submitted
+                if (function_exists('auditLog')) {
+                    auditLog($user_id, 'MEMBERSHIP_APPLICATION_SUBMITTED', 'membership_application', null, ['payment_id' => $payment_id, 'amount' => $payment_amount ?? null]);
+                }
                 header("Location: indemnity");
                 // Success message
                 $response = [