<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>PM-Japan Univa-pay Checkout</title>
  <link rel="stylesheet" href="./UPC_NEW.css">
</head>

<body>
  <h2> PM-Japan UPC Payment Checkout </h2>
  <br>
  <form id="payment-form" onSubmit="handleSubmit()">
    決済金額 (必須、半角数字) 　　　 　: <input type="number" id="amountInput" placeholder="(金額を入力)" min="1" required>
    <br>
    <br>
    MPM決済番号 (任意、半角英数記号) : <input type="text" id="orderID" pattern="^[a-zA-Z0-9]+$" placeholder="(決済番号)">
    <br>
    <br>
    <br>
    <button id="univapay-payment-checkout">支払処理</button>
  </form>
