<h4>Development & Stripe Page Fixes</h4><ul><li><strong>development.php:</strong> Guarded <code>$_GET[page]</code> with <code>?? ""</code></li><li><strong>index.php:</strong> Guarded <code>$_SESSION[super_admin]</code> (2 occurrences)</li><li><strong>stripe.js initialize():</strong> Added try/catch and response validation — the <code>await $.ajax()</code> would reject on token mismatch or server errors, causing uncaught promise rejection. Now checks for error status before attempting Stripe element creation, shows user message instead of crashing</li><li><strong>billing.controller.php:</strong> Added <code>ob_start()/while(ob_get_level()){ob_end_clean();}</code> to clean stray output before routes — same fix as domain controller</li></ul>