prepare("UPDATE users SET role = 'seller' WHERE id = ? AND role = 'buyer'"); $stmt->execute([$user['id']]); if ($stmt->rowCount() > 0) { // Update session role immediately so navbar updates without re-login $_SESSION['role'] = 'seller'; header("Location: sell.php?success=" . urlencode("Congratulations! Your account has been upgraded to Seller. Welcome aboard!")); exit(); } else { header("Location: upgrade_to_seller.php?error=" . urlencode("Upgrade failed. Please try again.")); exit(); } } renderHeader(__('upgrade_page_title')); ?>

→ Will be upgraded to