halaman buy.php
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<?php
include 'db.php';
if(!isset($_SESSION['user_id'])) { header("Location: login.php"); exit; }
$id = $_GET['id'];
$res = $conn->query("SELECT * FROM products WHERE id='$id'");
$p = $res->fetch_assoc();
?>
<h1>Beli Produk: <?= $p['product_name']; ?></h1>
<form method="post" action="checkout.php">
<input type="hidden" name="product_id" value="<?= $id; ?>">
Jumlah: <input type="number" name="quantity" value="1"><br>
<button type="submit">Checkout</button>
</form>
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