我正在使用PayPal的this部分中列出的代码来创建订阅按钮 .

这是代码:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

<form action="https://www.sandbox.paypal.com/cgi-bin/webscr" method="post">

    <!-- Identify your business so that you can collect the payments. -->
    <input type="hidden" name="business" value="some-facilitator@mail.com">

    <!-- Specify a Subscribe button. -->
    <input type="hidden" name="cmd" value="_xclick-subscriptions">
    <!-- Identify the subscription. -->
    <input type="hidden" name="item_name" value="Alice's Weekly Digest">
    <input type="hidden" name="item_number" value="DIG Weekly">

    <!-- Set the terms of the regular subscription. -->
    <input type="hidden" name="currency_code" value="USD">
    <input type="hidden" name="a3" value="5.00">
    <input type="hidden" name="p3" value="1">
    <input type="hidden" name="t3" value="M">

    <!-- Set recurring payments until canceled. -->
    <input type="hidden" name="src" value="1">

    <!-- Display the payment button. -->
    <input type="image" name="submit"
    src="https://www.paypalobjects.com/en_US/i/btn/btn_subscribe_LG.gif"
    alt="Subscribe">
    <img alt="" width="1" height="1"
    src="https://www.paypalobjects.com/en_US/i/scr/pixel.gif" >
</form>

</body>
</html>

但每次我点击“订阅”按钮时,paypal都会显示以下错误:

We’re sorry
Things don’t appear to be working at the moment

难道我做错了什么?